Title:
フィラメントランプ光量制御方法及びフィラメントランプ光量制御装置並びにフィラメントランプ光源装置
Document Type and Number:
Japanese Patent JP3999570
Kind Code:
B2
Abstract:
The invention relates to a light source unit control method and a light source control unit, and a light source unit comprising a filament lamp with a characteristic of having a light quantity changing almost in proportion to a control voltage, which comprise: a current detection sensor connected in series to the lamp; a multiplication circuit for generating a voltage Vw proportionate to the product of a terminal voltage V of the lamp and an output voltage V1 of said current detection sensor; a square root circuit for generating a voltage V2 proportionate to the square root of the control voltage V1; an error amplifier circuit for controlling an error to the minimum by comparing the output voltage Vw of said multiplication circuit and the output voltage V2 of said square root circuit; and a constant voltage power source unit for supplying an electric power to the filament lamp, the unit being connected to an output terminal of the error amplifier circuit, wherein the light quantity of the lamp is controlled by controlling the control voltage.
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Inventors:
Fumio Maruyama
Application Number:
JP2002156146A
Publication Date:
October 31, 2007
Filing Date:
May 29, 2002
Export Citation:
Assignee:
Sumita Optical Glass Co., Ltd.
International Classes:
H05B39/04
Domestic Patent References:
| JP58044688A | ||||
| JP2089799U | ||||
| JP63250091A | ||||
| JP8265965A | ||||
| JP11339993A | ||||
| JP2001155875A | ||||
| JP7013226A | ||||
| JP7073707A | ||||
| JP2002090639A | ||||
| JP2001143890A | ||||
| JP2002093588A |
Attorney, Agent or Firm:
Kenji Sugimura
Eiji Fujiwara
Kosaku Sugimura
Eiji Fujiwara
Kosaku Sugimura