Browse Prior Art Database

Variable Magnification Viewer

IP.com Disclosure Number: IPCOM000096511D
Original Publication Date: 1963-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Carlough, W: AUTHOR [+2]

Abstract

This is a compact variable-magnification viewer. It causes the center line of the projected image to remain at a fixed point 10 on a fixed viewing screen 12.

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Variable Magnification Viewer

This is a compact variable-magnification viewer. It causes the center line of the projected image to remain at a fixed point 10 on a fixed viewing screen 12.

The viewer consists of first casing 14 having light source 16, lens. 18, and slot 20, for receiving the object 22 to be projected. It has a second casing 24 having projection lens 26 in it and a mirror 28. Handle 30 is connected by shaft 32 to mirror 28. Shaft 32 is telescoped into tube 34. Casing 14 has shaft 36 connected to it which is also telescoped into tube 34. Tube 34 is connected to casing 24. A pin, not shown, on the backside of casing 14 rides in cam slot 38. Similarly, a pin, not shown, on the backside of casing 34 rides in vertical cam slot
40. Pin 42 connected to the top of mirror 28 rides in cam slot 44. Pin 46 connected to the lower side of mirror 28 rides in cam slot 48.

If it is desired to decrease the magnification of the image projected on screen 12, an upward force is exerted on handle 30. The resulting upward force applied to mirror 28 by shaft 32 is converted by cam slots 44 and 48 into a motion of the mirror upward and to the left. This effectively reduces the image distance S'. The raising of handle 30 also causes a force to be applied through tube 34 and casing 24. Such raises lens 26 and causes an upward force to be applied through tube 34 and shaft 36 to casing 14. Thus, casing 14 is moved upward and to the left under control of cam slot 38. The last-m...