Title:
METHOD FOR MEASURING QUANTITY OF LIGHT OF LED ARRAY, LED PRINTER HEAD, AND LED PRINTER
Document Type and Number:
Japanese Patent JP3604980
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for measuring a quantity of light of an LED array of a light quantity-measuring apparatus for measuring the quantity of light of not only an LED chip, but the LED array, and provide an LED printer head and an LED printer.
SOLUTION: In the method for measuring the quantity of light of the LED array which includes a jig for making the LED array for the LED printer head operate to emit light in a predetermined way, and a sensor part for detecting the quantity of light emitted by LEDs and generating an electric output proportional to the detected quantity of light, the LED array has, besides a primary emission band of an emission spectrum for forming images, a sub emission band separated by 50 nm or more from a peak wavelength of the primary emission spectrum. An optical element for highly efficiently guiding the quantity of light of the primary emission band and cutting the quantity of light of the sub emission band is inserted between the LED array and the sensor part when a spectral sensitivity of the sensor part shows nearly flat characteristics to the primary emission band and the sub emission band.
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Inventors:
Fukasawa
Application Number:
JP34358999A
Publication Date:
December 22, 2004
Filing Date:
December 02, 1999
Export Citation:
Assignee:
Canon Inc
International Classes:
H04N1/036; B41J2/44; B41J2/45; B41J2/455; G01J1/42; (IPC1-7): B41J2/44; B41J2/45; B41J2/455; G01J1/42; H04N1/036
Domestic Patent References:
| JP2000127482A | ||||
| JP10185684A | ||||
| JP8187891A | ||||
| JP9181358A | ||||
| JP61165519U |
Attorney, Agent or Firm:
Jyohei Yamashita