Optical sensor device

• US 20050178954A1
• Filed: 02/08/2005
• Published: 08/18/2005
• Est. Priority Date: 02/18/2004
• Status: Abandoned Application

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Yukawa, Yohei
• Application Number:
  US11/052,091
• Publication Number:
  US 20050178954A1
• Time in Patent Office: Days
• US Class Current: 250/221
• CPC Class Codes: B60Q 1/1423 Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic
• CPC Class Codes: B60Q 2300/312 Adverse weather
• CPC Class Codes: B60Q 2300/314 Ambient light
• CPC Class Codes: B60S 1/0818 including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like
• CPC Class Codes: B60S 1/0833 Optical rain sensor
• CPC Class Codes: B60S 1/087 including an ambient light sensor control of vehicle lights B60Q
• CPC Class Codes: H01L 31/101 Devices sensitive to infrared, visible or ultraviolet radiation

Abstract

An optical sensor device includes a luminescence element for emitting ray toward a windshield of a vehicle, and a photoreception element for detecting ray projected thereon. A sensor case is provided for accommodating the photoreception element and the luminescence element, which is activated by a control unit according to a predetermined luminescence pattern. The control unit switches an output of the photoreception element as an output of a rain sensor or an illumination sensor, based on the predetermined luminescence pattern of the luminescence element. Accordingly, the rain sensor and the illumination sensor can share the same photoreception element, thus small-sizing the optical sensor device.

Claims

1. An optical sensor device for a movable apparatus, the optical sensor device comprising:

a rain sensor for detecting a raindrop amount, including;

a luminescence element for emitting ray toward a windshield of the movable apparatus; and

a photoreception element for detecting ray reflected by the windshield; and

a control unit for activating the luminescence element according to a predetermined luminescence pattern, wherein;

the photoreception element also functions as an illuminance sensor for detecting illumination ray from an outside of the movable apparatus; and

the control unit switches an output of the photoreception element as an output of one of the rain sensor and the illumination sensor, based on the predetermined luminescence pattern of the luminescence element.

2. The optical sensor device according to claim 1, further comprising

a sensor case for accommodating the luminescence element and the photoreception element.

3. The optical sensor device according to claim 1, wherein

the photoreception element detects the illumination ray from an upper area with respect to the movable apparatus, so that the illuminance sensor is used as an auto-light sensor.

4. The optical sensor device according to claim 1, wherein

the photoreception element detects the illumination ray from an area in front of the movable apparatus, so that the illuminance sensor is used as a far-light sensor.

5. The optical sensor device according to claim 2, further comprising

a second photoreception element, wherein:

one of the photoreception element and the second photoreception element is used as a far-light sensor to detect the illumination ray from an area in front of the movable apparatus, and the other is used as an auto-light sensor to detect the illumination ray from an upper area with respect to the movable apparatus; and

one of the photoreception element and the second photoreception element is also used for the rain sensor.

6. The optical sensor device according to claim 5, further comprising

a base plate, on which the photoreception element and the second photoreception element are mounted.

7. The optical sensor device according to claim 5, wherein the luminescence element, the photoreception element and the second photoreception element are accommodated in the same sensor case.

8. The optical sensor device according to claim 1, wherein the movable apparatus is a vehicle.

9. An optical sensor device for a vehicle, the optical sensor device comprising:

a rain sensor for detecting a raindrop amount, including;

a luminescence element for emitting ray toward a windshield of the vehicle; and

a photoreception element for detecting ray projected thereon;

a sensor case for accommodating the luminescence element and the photoreception element; and

a control unit for activating the luminescence element according to a predetermined luminescence pattern, wherein;

the photoreception element also functions as an illuminance sensor for detecting illumination ray from an outside of the vehicle;

when the luminescence element is activated to emitting the ray, the control unit switches an output of the photoreception element as an output the rain sensor; and

when the luminescence element is not activated, the control unit switches the output of the photoreception element as an output the illumination sensor.