Exposure device with filter

• US 5,018,054 A
• Filed: 04/20/1990
• Issued: 05/21/1991
• Est. Priority Date: 04/24/1989
• Status: Expired due to Term

• Current Assignee: Sahrp Kabushiki Kaisha
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Ogura, Mitsuru, Ohashi, Kunio
• Primary Examiner(s): Husar, Stephen F.
• Assistant Examiner(s): Neils, Peggy A.
• Application Number:
  US07/511,798
• Time in Patent Office: 396 Days
• Field of Search: 362/217, 362/263, 362/293, 362/211, 362/307, 313/112, 313/273
• US Class Current: 362/211
• CPC Class Codes: F21V 9/20 Dichroic filters, i.e. devices operating on the principle of wave interference to pass specific ranges of wavelengths while cancelling others
• CPC Class Codes: G03B 27/542 for copying cameras, reflex exposure lighting

Abstract

An exposure device has a bar-like lamp with a filament having luminescent and non-luminescent members connected in alternating series. A filter is disposed in the vicinity of the lamp and is composed of a plurality of filter plates arranged in a longitudinal direction of the filament. Seams between the filter plates are positioned vis-a-vis with the non-luminescent members of the filament of the lamp to reduce disturbances by the seams to the light emerging from lamp.

Claims

1. An exposure device with a filter, comprising a bar-like lamp including a filament constructed of a plurality of luminescent members and non-luminescent members which are connected in series alternately, and a filter disposed in the vicinity of said lamp, said filter being composed of a plurality of filter plates arranged in a longitudinal direction of the filament, seams between said filter plates being set vis-a-vis with said non-luminescent members of said filament of said lamp.

2. The exposure device of claim 1, in which each of said filter plates has a rectangular configuration.

3. The exposure device of claim 1, in which each of said filter plates has a parallelogram configuration.

4. The exposure device of claim 1, in which each of said filter plates has a trapezoid configuration.

5. The exposure device of claim 1, in which said filter plates are heat absorbing filter plates.

6. The exposure device of claim 1, in which said filter plates are heat reflection filter plates.

7. The exposure device of claim 1, in which said lamp is a halogen tungsten lamp.