Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

इंटरनेट मानक

“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda

“Invent a New India Using Knowledge”

“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru

“Step Out From the Old to the New”

“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan

“The Right to Information, The Right to Live”

“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam

“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 5673 (1970): Methods of tests for still projectors [MED32: Photographic Equipment]

IS : 5673 - 1970

Indian Standard METHODS OF TESTS FOR

STILL PROJECTORS

Cinematographic Equipment Sectional Committee, ETDC 47

Chairman

SH~U P. N. DEOBHAKTA

Members

Representing

Directorate General of Technical Development, New Delhi

SHRI BALRAJ BHANOT ( Altsrnata to Shri P. N. Deobhakta )

SHRI S. N. AGARWAL Cinecita Private Limited, Bombay SHRI J. R. NAHAR ( Alternate)

SHRIJ. N. BISARIA Films Division (Ministry of Information C Broad- casting ), Bombay

SHRI Y. R. CHAUHAN Cinesales Corporation, Delhi SHRI RS. CHAUHAN ( Alternate )

DR A. F. CHHAPGAR National Physical Laboratory ( Acoustics Division ) ( CSIR ), New Delhi

LT-COL M. B. DWIVEDI Department of Defence Production (Ministry of Defence )

SHRI D. C. VAT~A (Alternate ) SHRI BHUPON G~OSH Cine Mechanical Works, Calcutta

SHRI MANNA LADIA ( Alternate ) SHRI P. H. KAPILA Kine Engineers, Bombay SHRI A. MAJID KAZI Amco Engineering Corporation, Madras SHRI P. N. KOHLI _ Department of Teaching Aids, National Council Of

Educational Research and Training, New Delhi SHRI N. P. BHATTACHARYA ( Alternate )

SHRI B. A, MUTRY In personal capacity ( Hari .Niwas, Bombay ) SHRI M. E. NAGARAJAN Photophone Equipments Limited, Bombay

SHRI R. RATAGOPALAN ( Alternate ) Film Federation of India. Bombav SHRI P. J. PATEi

SSRI C. S. RAMANATHAN Hindustan Photo Films Manufacturing Co Ltd, Ootacamund

DR S. K. JAIN ( Alternate) SHRI RAM PRASAD National Physical Laboratory ( Optics Division )

( CSIR ), New Delhi SHIU M. SANKARALINGAM Dire;zctr General of Supplies and Disposals, New

SHRI G. R. BHATIA ( Alternate ) SHRI U. S. SAXENA Film Institute of India ( Ministry of Information &

Broadcasting ), Poona

( Continued on page 2 )

INDIAN STANDARDS INSTITUTION MANAK BHAVAN, 9 BAHADDR SHAH &AFAR MARG

NW PFJm I

IS:5673-1970

( Continuedfromfiage 1 )

Members Representing

SHRI V.J. B. WADIA SHRI S. M. BHISE ( Alternate )

SHRI Y. S. VENKATESWARAN, Director ( Elec tech )

Wadia Lighting Equipment Pvt Ltd, Bombay

Director General, ISI ( Ex-oficio Member )

Secretay

SHRI T. RAJARAMAN

Deputy Director ( Elec tech ), IS1

Panel for Still Projectors, ETDC 47 : P1

Convener

SHRI~N.P. BHATTACHARYA Department of Teaching Aids, National Council of Educational Research and Traininig, New Delhi

Members

SHRI S.N. AGARWAL SHRI Y.R.CHAUHAN SHRI P.H.KAPILA SHRI LAK~HMI SAGAR

Cinecita Private Limited. Bombay Cinesales Corporation, Delhi . Kine Engineers, Bombay The Oriental Science Apparatus Workshops, Ambala

Cantt _-

SHRI B. L.LELE SHRI NAND KISHOR SHRI RAMPRASAD

Pate1 India Pvt Ltd, Bombay Hargolal &, Sons. Ambala Cantt National Physical Laboratory ( CSIR ), New Delhi

2

IS : 5673 - 1970

Indian Standard METHODS OF TESTS FOR

STILL PROJECTORS

0. FOREWORD

0.1 This Indian Standard was adopted by the Indian Standards Institution on 4 June 1970, after the draft finalized by the Cinematographic Equip- ment Sectional Committee had been approved by the Electrotechnical Division Council,

0.2 Work on the formulation of standards for various audio-visual equip- ment has been undertaken with a view to establishing acceptable levels of quality and performance as well as bringing about a degree of interchange- ability in these units. This is one of a series of Indian Standards on audio- visual equipment. .

0.3 This standard is intended to deal with the methods of tests for still projectors. The performance requirements of still projectors are covered in IS : 5778-1970”.

0.4 In preparing this standard assistance has been derived from BS : 4120- 1968 ‘ Methods for the Measurement of Performance of Still Projectors ’ issued by British Standards Institution.

0.5 For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, ~express- ing the result of a test, shall be rounded off in accordance with IS : 2- 196Ol_. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

1. SCOPE

1.1 This standard lays down methods of tests for determining the principal performance characteristics of still projectors capable of prolecting slides or film strips or both.

*Specification for still projectors ( under print ). tRules for rounding off numerical values ( reuised ) (

3

I

IS t 5673 - 1970

2. TERMINOLOGY

2.0

2.1

For the purpose of this standard, the following definitions shall apply.

Slide --It is an assembly comprising of:

a) A transparency for projection by transmitted light, b) An appropriate mask, and c) A holder and/or transparent protecting cover.

2.2 Picture Area - That area on the film occupied by the image.

2.3 Mask- A piece of opaque material containing an aperture which limits the area to be projected.

2.4 Mask Aperture - The aperture in a mask.

2.5 Slide-Carrier - A device by which slides are placed in position for projection.

2.6 Film Strip - A strip of 35 mm film carrying photographic images suitable for still, but not cinematographic projection.

2.7 Slide Projector - An optical device capable of projecting the images from slides only.

2.8 Combined Still Projectors for Slides and Film Strips -An optical device capable of projecting the image from 5 x 5 ( cm ) slides and alternatively from single- or double-frame film strip.

2.9 Single Frame - Frame having a dimension of 18 x 24 mm.

2.10 Doable Frame - Frame having a dimension of 24 x 36 mm.

2.11 Film Strip Projectors- An optical device capable of projecting the images from single- or double-frame film strip.

2.12 Film-Carrier - A device by which a film strip is placed in position for projection.

2.13 Film-Carrier Mask strip.

- A mask to restrict the projected area of film

3. GENERAL CONDITIONS OF TEST

3.0 The following conditions of tests shall apply unless otherwise specified in a particular method of test. n

4

IS : 5673 - 1970

3.1 The supply voltage shall be such that the lamp voltage shall be within zt5 percent of the rated voltage indicated on the lamp. For photometric tests, the supply voltage shall be such that the lamp voltage is maintained within f 1 percent of the voltage rating marked on the lamp; where the lamp has been marked with a range of voltage the maximum voltage indi- cated shall be taken for consideration.

3.2 The ambient temperature shall be 27O zt 5°C.

3.3 The lamp shall be of the type for which the projector is designed,

3.4 The aperture test slide to be used for all tests except resolving power (.see 5 ) shall comply with the dimensions given in Table 1 and the follow- ing additional requirements:

a) The distance from the~edge of the aperture opening to the side of the slide shall be equal on both sides to within O-1 mm.

b) The angles between adjacent edges of the slide shall be 90” f 3’. c) The edges of the aperture shall be parallel with the sides of the

slide to within 3’. d) The edges of the aperture shall be chamfered from one side only

at about 15” to give an edge thickness of not more than 1 mm.

TABLE 1 TEST SLIDE DIMENSIONS

NOMINAL PICTURE AREA

mm

( Clause 3.4)

OVERALL SIZE TEST SLIDE rp--L T

Thickness Mask Aperture mm mm mm _

I 3.2+ ’ - 0.05 15.5 f 0.5 x 22.5 f 0.5

3.2+ ’ -095 22.5 * 0.5 x 22.5 * 0.5 18x24

24x24 24x36 50.0 _+ 88x 50.0 2 8’8 1 3.2+’ - 0.5

22.5 * 0.5 x 34.3 * 0.5 28x28 with 2 mm radius 40x40 J on corners

3*2+ ’ - 0*5 26.5 f 0.2 x 26.5 f 0.2

1 3*2+ ’ - 0.05 37.5 * 0.7 x 37.5 * 0.7

55x55 69.9 f 0.8 x699 * 0.8 with 2 mm radius on corners

3*5+ O 0.05 53.5 * 0.7 x 53.5 f 0.7 -

h

5

IS : 5673 - 1970

3.5 The test slide used in the tests shall have the maximum mask aperture for which the projector is designed. Where alternative optical systems are provided the projector shall be tested with the maximum mask aperture for which each system is designed.

4. ACCURACY OF LOCATION OF THE PICTURES PROJECTED ON THE SCREEN

4.1 Procedure - Use the projector under test to project the image of a standard aperture test slide, described in 3.4 and 3.5, on to a matt white surface Locate the~slide so that the long dimension of the projected image is horizontal. The plane of the screen shall be at right angles to the optical axis of the projector and the lens adjusted so that the edge of the aperture test slide is sharply focused.

Insert the aperture test slide in the projector in as many different ways as possible, that is, in each side of a shuttle type shde carrier and with a bias to the left and to the right in each case. The long dimension of the projected picture shall always be horizontal and the aperture test slide shall always be inserted in the projector with the same side facing the screen and the same edge uppermost. picture on the screen for each test.

Mark the position of the projected

4.1.1 Error of Position -The error of position shall be taken as the distance between the centres of the two projected images with the greatest mutual displacement, expressed as a percentage of the picture width,

4.1.2 Error of Alignment - The error of alignment shall be taken as the jangle between the corresponding sides of the two projected images which have the greatest mutual angular displacement.

5. RESOLVING POWER OF LENS

5.1 Procedure - standard resolution

Use the projector under test to project an image of the test slide described in 5.1.1, upon a matt white surface.

Locate this surface at such a distance from the projector that the long dimension of the Projected image will be one metre or more, in order that the observer will have no difficulty in distinguishing the number of lines resolved.

Ensure that the surface is perpendicular to the projection axis and that the lens is so focused that the test pattern at the centre of the test slide is projected as sharply as possible.

At each test point examine each group of lines in the test pattern consecutively to the limit of resolution commencing with the largest group,

6

ISi!W3-1970

in the test pattern taking radial and tangential directions together. The limit of resolution occurs in the group preceding that which contains two unresolvable lines, that is, lines not identifiable as separate lines or not running in correct direction, and the resolving power of the lens at this point is the number of lines per millimetre in the group containing the limit of resolution. If smaller groups reappear as distinguishable beyond the limit of resolution those smaller groups shall be disregarded,

5.1,1 Resolution Test Slide - The resolution test slide shall be a flat glass plate carrying test patterns in accordance with Fig. 1 and distributed over the aperture area in accordance with Fig. 2A or 2B. Identification of the test patterns by letter, A, B., C, etc, should be in accordance with Fig. 2A or 2B. The resolution test shde shall comply with the appropriate overall dimensions and thickness requirements given in Table 1.

NOTE 1 - Figures indicate number of black lines per millimetre.

NOTE 2 - A group consists of one set of horizontal and vertical lines.

FIG. 1 LENS REVOLUTION TEST PATTERNS

The test pattern shown in Fig. 1 shall include at least 10, 14, 20, 28, 40, 56 and 80 lines/mm by ‘ X lines per mm ’ is meant dark parallel lines 1*5/x mm long and 0*5/x mm wide, separated by a light space 0*5/x mm wide.

The dark lines of the test pattern shall have a photographic density of at least 2.0 greater than the density of the background.

6. UNIFORMITY OF ILLUMINATION

6.1 Procedure - The test shall be carried out source of illumination than that of the projector.

Immediately prior to the commencement of shall be run for half an hour.

7

with no other primary

the test the equipment

IS:5673-1970

* ‘t

d

t

7’ =G 27x38-1

OC 23x35 OF

;

QF

Iii 0 Kl A

Q0 B 0 Ot7 -c

0

2B

All dimensions in milliietres.

Fra. 2 REVOLVINIJ POWER TEST CHARTS

8

IS : 5673 - 1970

Focus an image of the aperture test slide on the surface of a screen with light measuring devices in the plane of the screen as shown in Fig. 3. Adjust-the throw until the long dimension of the projected image is 1 m f 5_mm. Minimize the effects of stray light so that they do not affect the validity of the test result.

Measure the illumination at the centre of the screen, and at each of four points, one in each corner of the screen and located at a distance equal to 10 percent of the long dimension of the projected image, from the top or bottom edge, and the same distance from the side edges of the projected image ( see Fig. 3 ).

C ---

f ---

g+ I.+(( I

c 10x - .

C is the centre of the screen x = 100 f 2 mm

FIG. 3 DUMMY SCREEN FOR MEASUREMENT OF UNIFORMITY OF ILLUMINATION

6.2 Result -Record the uniformity of illumination as the ratio of the corner to centre illumination at each corner. Record the aperture test slide used,

7. TEMPERATURE-RISE OF SLIDE

7.1 Procedure -A test slide (with silver, not dyed image ) of uniform density of 2.0 or greater shall be used.

7.1.1 A thermocouple of wire not greater than 0.1 mm diameter shall be in contact with the test slide at the centre of the standard maximum

-aperture. The thermocouple shall be held in contact with the emulsion side of the test side by its being bound between cover glasses.

9

IS : 5673 - 1970

7.1.2 Insert the slide in the projector with the thermocouple on the side away from the light source,

7.1.3 Run the light source in the projector continuously for one hour with the test slide in place. projector is designed.

The lamp shall be new and one for which the

7.1.4 At the end of one hour measure the rise in temperature above an ambient ,temperature of 27” & 5”C, using an instrument accurate to *2 deg C.

7.2 Result - Record the rise in temperature of-the slide, above the ambi- ent temperature, in deg C.

8. DISTANCE BETWEEN LENS AND SCREEN FOR A 1 METRE WIDE PICTURE

8.1 ‘Procedure -Use the projector to project an image of an aperture test slide upon a screen. Adjust the distance between the projector and screen until the longer edge of the focused image is 1 m f5 mm. Measure the distance between the screen and the lens. If the focal length of the lens can be adjusted the procedure shall be carried out at the extreme limits of the focal length.

8.2 Result - Record the distance or the maximum and minimum distances between the screen and lens in metres.

9. LIGHT OUTPUT

9.1 Procedure - Focus the projector on the surface of a screen, such that the distance between the lens and screen is equal to the distance, or the minimum distance, as measured in 8.1. The screen shall be divided into nine similar rectangles of equal area. Measure the illumination at the centre of each of these nine areas in lux ( lumens/m2) ( see Fig. 4 ). The average illumination shall Abe taken as the arithmetic mean of the nine readings. Measure the area of the image produced in square metres. Minimize the effects of stray light SO that they do not affect the validity of the test result.

9.2 Result -Record the light output, in lumens, as the product of the average illumination and the area of the image produced.

10. WORKING TEMPERATURE OF CASING

10.1 Procedure - Using a thermocouple of wire not greater than 0.32 mm diameter, so chosen and positioned that it has the minimum effect on

10

IS : 5673 - 1970

3y --- y .- -- -.- y

:i r--- --+ -+- /---- 6

X

3x + -+ $

X

I

-+I-- Q .

+-

C?y=lm*5mm

FIG. 4 DUMMY SCREEN FOR MEASUREMENT OF LIGHT INTENSITY

the temperature of the part under measurement, determine the temperature of the hottest part of the casing, excluding the grill, after the projector has been switched on for one hour.

10.2 Result deg C.

-Record the temperature of the hottest part of the casing in

IS:

4495-1968

4496-1968

4497-1968

5260-1969

5266?969

5353-1969

*5636-1970

5673-1970

55674-1970

INDIAN STA

ON

Cinematographic

NDARDS

Equipment

Method of measurement of light output of cinematograph projectors ( for narrow gauge film) . . . .,. ,.. . . .

Screen luminance for the projection of 16 mm film by incandes- cent lamps . . . . . . . . . . . . . . . . . .

16 mm portable sound-and-picture cinematograph projectors . . .

Test films for 16 mm sound-and-picture cinematograph projectors

Screen luminance for the projection of 35 mm film on m&tt and directional screens . . . ..* . . . . . . . . .

Cans for 16 mm projector spools . . . . . . . . . . . .

Methods of tests for still projectors . . . . . . . . . . .

16 mm projector spools . . . . . . . . . . . . .

Rs

2-00

2.50

3.50

6.00

4.90

-

4.00