公开(公告)号：US3721562A

公开(公告)日：1973-03-20

申请号：US3721562D

申请日：1971-07-29

Applicant: POLAROID CORP

Inventor： LAND E

IPC: G03C8/52 ,  G03C5/38 ,  G03C5/54 ,  G03C7/00

CPC classification number: G03C8/52 ,  Y10S430/162

Abstract: Novel system for forming visible images wherein an aqueous alkaline processing composition is applied between a first sheet comprising a photosensitive element and a second sheet including an acid-neutralizing layer, said sheets being adapted for being maintained together after application of the processing composition. In a preferred embodiment, a system is disclosed for forming negative images wherein a developed and fixed negative image in silver is provided with a transparent overlay through which the image may be viewed. In another disclosed embodiment, an image in color, which may be a positive transfer image, is provided with such a transparent overlay.

公开(公告)号：US3719422A

公开(公告)日：1973-03-06

申请号：US3719422D

申请日：1971-01-20

Applicant: POLAROID CORP

Inventor： LAND E ,  NORRIS P

IPC: G03B13/02 ,  G01C3/04 ,  G01C3/14

CPC classification number: G03B13/02

Abstract: This disclosure depicts a number of novel Fresnel imaging structures incorporated in photographic rangefinding and viewfinding means. Each Fresnel imaging structure is both focal and afocal for simultaneously providing a view of a selected field and for projecting into the field a virtual image of a rangefinding or framing reticle.

Abstract translation: 本公开描述了并入照相测距和取景装置中的许多新颖的菲涅尔成像结构。 每个菲涅耳成像结构都是焦点和无焦点，用于同时提供所选场景的视图，并且用于向场中投射测距或成帧标线的虚拟图像。