The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 01, 1989
Filed:
Feb. 05, 1988
Brad E Meyers, Redmond, WA (US);
Other;
Abstract
The image intensifier (22) of night telescope (12) is protected by a deactivate circuit (FIG. 4) which is in series with an off-on switch (S) between a source of electrical energy (28) and the image intensifier (22). The light sensor (26) measures ambient light. If the light level is below a predetermined light level, at which it is safe to operate the image intensifier (22), the light sensor (26) does not conduct. This causes an amplifier circuit (A-1, A-2) to deliver a negative voltage to the base of a transistor (Q-1). This enables the transistor (Q-1) to transmit electrical current from the source (28) to the image intensifier (22). Whenever ambient light exceeds the predetermined light level, the photoconductive sensor (26) conducts. In response to this happening the amplifier circuit (A-1, A-2) delivers a positive voltage to the base of the transistor (Q-1). In response, the transistor (Q-1) becomes incapable of transmitting a current onto the image intensifier (22).