Range finding device

• US 5,608,513 A
• Filed: 08/02/1994
• Issued: 03/04/1997
• Est. Priority Date: 08/06/1993
• Status: Expired due to Term

• Current Assignee: Fuji Electric Company Limited (Fuji Electric Systems Company Limited)
• Original Assignee: Fuji Electric Company Limited (Fuji Electric Systems Company Limited)
• Inventors: Komatsu, Sachiaki, Izumi, Akio
• Primary Examiner(s): ENGEL, JAMES J
• Application Number:
  US08/284,100
• Time in Patent Office: 945 Days
• Field of Search: 156/94, 156/295, 156/304.5, 156/305, 156/578, 356/3
• US Class Current: 356/3
• CPC Class Codes: G01S 7/4813 Housing arrangements
• CPC Class Codes: G02B 7/32 using active means, e.g. light emitter including both an active and a passive focus detecting device G02B7/285; using ultrasound G02B7/40

Abstract

A range finding device for automatic focussing can be accurately assembled and has a good external appearance. The range finding device includes an optical lens block having coupling members projecting from the lenses, which further include a protrusion and side walls formed on both sides of the protrusion which are taller than the protrusion. The length of the protrusion is shorter than width of the side walls. The protrusion is partly constricted by a recess portion to form a constriction portion. The range finding device further includes an optical waveguide case having a pair of windows formed on an upper surface and a pair of coupling members formed on both sides of the windows, which further includes a fitting surface that fits to a bottom surface of the coupling member, a pair of protrusions standing on both ends of the fitting surface between which the side walls of the coupling member are inserted, and a liquid pool formed as a shallow groove on the fitting surface.

Claims

1. A range finding device comprising:

an optical lens block comprising an object lens and a first coupling member, projecting from a side of said object lens, said first coupling member further comprising a recess portion formed thereon; and

an optical waveguide case comprising a second coupling member to which said first coupling member fits, said second coupling member including a fitting surface to which a bottom surface of said first coupling member fits, and a liquid pool formed on said fitting surface at least a part thereof exposed to said recess portion;

wherein said first coupling member further comprises a constriction portion constricted by said recess portion; and

wherein said constriction portion further comprises a side wall slope.