Optical mouse with uniform light projection

• US 20040246233A1
• Filed: 06/06/2003
• Published: 12/09/2004
• Est. Priority Date: 06/06/2003
• Status: Active Grant

• Current Assignee: Unity OPTO Technology Company Limited
• Original Assignee: Unity OPTO Technology Company Limited
• Inventors: Chang, Wei, Hung, Hsien-Yeh
• Granted Patent: US 6,927,759 B2
• Time in Patent Office: Days
• US Class Current: 345/166
• CPC Class Codes: G06F 3/0317 in co-operation with a patterned surface, e.g. absolute position or relative movement detection for an optical mouse or pen positioned with respect to a coded surface
• CPC Class Codes: G06F 3/03543 Mice or pucks G06F3/03541 takes precedence

Abstract

An optical mouse includes a bottom casing, a top cover mounted to the bottom casing to define an interior space therebetween, a circuit board and a lens set arranged in the interior space. The bottom casing defines an opening. A detecting device is mounted to the circuit board. A receiving portion and a light emitting diode (LED) are mounted to a bottom side of the detecting device in alignment with a slot defined in the circuit board. A solder pad to which an electrical conductor is connected forms a central bore and is positioned on a circumferential margin of a light projection surface of the LED to allow light projected from the light projection surface to transmit through the central bore. The lens set is arranged between the circuit board and the bottom casing, comprising a reflection member located below the LED for redirecting the light from the LED to the fixture surface and a lends, which is located below the receiving portion of the detecting device and in alignment with the opening of the bottom casing, converging the reflected light toward the receiving portion of the detecting device. Since the light from the LED is allowed to pass through the central bore of the solder pad and is not substantially blocked by the solder pad, a uniform projection of light can be accomplished. The assembly of the optical mouse is simplified and an excellent transmission of light can be realized.

Claims

1. An optical mouse comprising:

a housing comprising a bottom casing and a top cover mounted to the bottom casing, the bottom casing defining an opening;

a circuit board received in the housing between the bottom casing and the top cover, the circuit board comprising a detecting device, a receiving portion being formed on a bottom side of the detecting device and substantially aligned with the opening of the bottom casing, a light emitting diode device being mounted to the bottom side of the detecting device, the light emitting diode device comprising a chip having a light projection surface from which a light beam is projected, a solder pad for connection with an electrical conductor forming a central bore and mounted to the light projection surface whereby light from the light projection surface is allowed to pass through the central bore of the solder pad without being blocked thereby; and

a lens set mounted to the bottom casing and below the circuit board, comprising a reflection member below the illuminating device and a lens located below the receiving portion and substantially aligned with the opening of the bottom casing.

2. The optical mouse as claimed in claim 1, wherein the lens set further comprises an additional lens located below the light emitting diode device with the reflection member below the additional lens.