Title:
【発明の名称】LEDアレイの診断装置
Document Type and Number:
Japanese Patent JP2834521
Kind Code:
B2
Abstract:
A light emitter array diagnostic apparatus for diagnosing whether individual light emitter elements (E1-En) in a light emitter array unit (3) normally emit light or not includes a check data generator (1) which supplies check data so as to cause sequential simultaneously emission of light from at least one light emitter element (E1-En) in each of a plurality of groups of the light emitter array unit (3) divided into such groups (31, 32, 33, ..., 3n), until all of the light emitter elements (E1-En) emit light. The light outputs from the individual light emitter elements (E1-En) are received and photoelectrically converted by photo detector units (41, 42, 43, . .., 4n), and a diagnostic unit (4) connected to the photo detector units (41,42,43,--4n) and including an adder (50) and/or a comparator (6) diagnoses the state of luminescence of the individual light emitter elements (E1-En).
Inventors:
HIRANE HIDEO
TANNO KYOHIKO
MASUDA KAZUTO
TANNO KYOHIKO
MASUDA KAZUTO
Application Number:
JP6266990A
Publication Date:
December 09, 1998
Filing Date:
March 15, 1990
Export Citation:
Assignee:
HITACHI SEISAKUSHO KK
International Classes:
B41J29/46; B41J2/44; B41J2/45; B41J2/455; G03G15/04; H01L33/08; H01L33/58; (IPC1-7): B41J2/44; B41J2/45; B41J2/455
Domestic Patent References:
| JP62179964A | ||||
| JP63172287A | ||||
| JP6325066A | ||||
| JP61206274A | ||||
| JP62276431A |
Attorney, Agent or Firm:
Masami Akimoto