Patent GB-999626-A (GB)
Title: Viewing apparatus
IPC: G03B21/32
Filed: 1961-10-26
Abstract: 999,626. Viewing apparatus for telephone directories. EASTMAN KODAK CO. Oct. 26, 1961 [Oct. 31, 1960], No. 38318/6L Heading G2J. The invention relates to apparatus for the rapid location and viewing of a selected image from a number of images on a strip and has application for example in telephone exchanges for the rapid look-up of telephone subscriber listings from microfilmed records. As shown (Fig. 1), a viewing apparatus for such specified application comprises a viewing screen 13, an optical projection system (itself comprising a lamp 23, condenser 25, lens 33 and mirrors 27, 29 and 31) for projecting an image from a microfilm strip in a holder 22 in a transport device 15 on to the screen 13 and compartments 19, 21 for storing holders 22 not for the moment being viewed. The actual film strip F (Fig. 10) bearing images of pages of a directory is supported in an inner carrier 43 which is itself slidably supported in an outer carriage 41. A flared front end 53 (Fig. 11) of each outer carrier 41 carries identification marks (Fig. 2- not shown) which may be the first name from the first page on the strip carried by the holder. The upper surface 55 (Fig. 10) of the holder 22 bears reference marks at regular intervals (cf.Fig. 8, not shown) which intervals correspond to the spacing of the microfilmed pages on the strip F and which reference marks may be the first names on the corresponding pages. In operation, when it is desired to look-up a subscribers' phone number, the appropriate strip holder 22 is selected from the storage compartments 19, 21, this holder 22 is laid on the lower end of the transport device 15 in one of the two receivers 63 (Fig. 3) whereby the outer carrier 41 is held fast against lugs 69 and a lug 72 is engaged behind the inner film strip holder 43 and then a slide actuator 79 which is slidably mounted in a channel 83 and is coupled to the lug 71 and a transparent slidably mounted platen 65 by way of a slide 81 and bracket member 85 is manually brought into register with the nearest previous reference name on the aforesaid surface 55 whereby the inner holder 43 with its film strip F is slid out of the outer holder 41 (by the lug 71) and into the upper part of transport device 15 to such an extent as to bring the appropriate page on the film F into position for projection by way of one of the lenses 33 (Fig. 3) onto the screen 13, the strip F and holder 43 being held on the platform 65 for this projection. The inner carriers 43 are normally releasably held in the outer carrier 41 by spring detent means 56 (Fig. 11) and finger recesses 49, 51 are provided in the said flared front ends to the carriers 41. Various means including guide flanges and grooves and spring rollers are provided for holding the strips F in correct position for projection. Two slide actuators 79 are provided which may be coupled for movement together as in Fig. 16, (not shown). Certain numbers, such as those of the emergency services, may be more permanently mounted on the platen 65 in the region thereof between a key 75 and the bracket 85. Specification 999,627 is referred to.