JP3049931U - Mouse photoelectric detection device - Google Patents

Abstract

(57) [Problem] To provide a photoelectric detection device with improved detection accuracy in a mouse. SOLUTION: In a photoelectric detection device of a mouse, a dihedral surface or a tetrahedral surface is formed around a portion corresponding to a photosensitive chip on a light receiving surface of a receiving element, and a backlight or a quenching substance is applied on each slope. When light is projected on the light receiving surface of the receiving element, the detection chip is prevented from being affected by interference due to the diffusion of approaching light, and the accuracy of signal reception is improved.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a kind of photoelectric detection device provided in a kind of computer mouse, and in particular, in a case where a kind of work light source projects light to a light receiving surface of a receiving element, a detection chip is made not to receive interference due to diffusion of nearby light. It concerns improved signal reception accuracy.

[0002]

[Prior art]

 An encoder generally applied to a mouse has a structure as shown in FIG. It includes one disk 60, a light emitting element 70, and a receiving element 80, wherein the light emitting element 70 is provided near the disk 60 so that the light emitting element 70 projects light to the disk 60. The disk 60 is fixed to the rotating shaft 50 by its central shaft hole, and is configured to rotate integrally with the rotating shaft 50, and is rotated by one trackball. A plurality of light-transmitting portions 61 are provided on the outer periphery of the disk 60, and a non-light-transmitting portion 62 is provided between each two light-transmitting portions 61. The outer periphery of the disk 60 is made of a light-transmitting material. The receiving element 80 has a pair of photosensitive chips 81 adjacent to each other and receives the light transmitted through the light transmitting section 61.

When the disk 60 rotates, the light generated by the light emitting element 70 is cut off by the light-blocking portion 62 and the light-transmitting portion 62 of the disk 60 being shielded and translucent to form a working beam. When the working beam is received by the photosensitive chip 81, energy is generated, and as the disk 60 rotates continuously, a sine waveform is obtained on the waveform display, and (0,0), ( (0, 1), (1, 1), and (1, 0) are obtained. FIG. 2 is a diagram showing the generation of these four signals.

However, each of the light emitting element 70 and the receiving element 80 has a flat light receiving surface corresponding to the disk 60 in terms of structure, so that when the working beam reaches the light receiving surface of the receiving element 80, the light is Interference is likely to occur due to the spread of

FIGS. 3 and 4 show sine waves A and B generated by the photosensitive chip 81 receiving the work beam from the light emitting element 70 and the square waves A 1 generated by the rectifier circuit when the disk 60 rotates. B1 is shown, in which C is the interference light formed by the working beam 71 entering the receiving element 80 and being diffused. The effect of the interference light C on the receiving element 80 is shown in FIG. In FIG. 5, the waveform B is a theoretical sinusoidal waveform. However, in actuality, when the work beam 71 has not yet approached the photosensitive chip 81 due to the interference light generated by the light entering the receiving element 80, the waveform has already been obtained. The photosensitive chip 81 generates energy, thereby generating a sine wave indicated by X.

As can be seen by observing this waveform, the waveform generated by the photosensitive chip 81 due to the interference light C cannot reach low energy, that is, when the work beam 71 is not in contact with the photosensitive chip 81. This is because energy has already been generated due to interference. Even if the working beam 71 is already separated, the energy of the photosensitive chip 81 cannot be released by the interference light C, so that the sine wave energy displayed by the waveform display cannot obtain sine waves such as A and B. Therefore, the square wave generated by the rectifier circuit is also different from A1 and B1.

[0007] Therefore, in a photoelectric detection device for a mouse of a computer, there is a demand for a structure capable of effectively overcoming interference light and improving the accuracy of signal reception when light is projected on a light receiving surface of a receiving element. I was

[0008]

[Problems to be solved by the invention]

 It is an object of the present invention to provide a kind of mouse photoelectric detection device. Specifically, in a mouse photoelectric detection device, a bi-sloping surface or a quadrilateral surface is formed around a portion corresponding to a photosensitive chip on a light receiving surface of a receiving element. By forming a slope and applying a reflection or extinction substance on each slope, when light is projected on the light receiving surface of the receiving element, the detection chip is not affected by the interference due to the diffusion of approaching light, and the signal The task is to improve the accuracy of reception.

The present invention also provides the mouse photoelectric detection device, wherein at least one pair of dihedral or tetrahedral surfaces is formed on a light emitting surface of the light emitting element around a portion corresponding to the detection chip of the receiving element. It is an object of the present invention to be able to project one or more bundles of work beams under control.

[0010]

[Means for Solving the Problems]

 The invention of claim 1 includes at least one light emitting element 1, at least one disk 2 and at least one receiving element 3, wherein one light emitting element 1 is provided near each disk 2 to emit light. An element 1 can project light onto a disk 2, one receiving element 3 is provided near the periphery of each disk 2, and a set of adjacent photosensitive chips 31 is provided in each receiving element 3, Reference numeral 31 denotes a mouse photoelectric detection device configured to receive an optical signal of a light beam transmitted through the disk 2, and at least one set of the light receiving surface of each receiving element 3 is provided around a portion corresponding to the photosensitive chip 31. A two-slope or four-slope surface 32 is provided to eliminate the interference phenomenon formed by the proximity light when the light beam reaches the light receiving surface of the receiving element 3 so that an accurate signal can be received. Photoelectric detection device It is set to.

According to a second aspect of the present invention, there is provided the mouse according to the first aspect, wherein a light reflecting material or a light absorbing material is coated on the slope 32 of the light receiving surface of the receiving element 3. It is a photoelectric detection device.

According to a third aspect of the present invention, at least one set of two slopes or four slopes is formed around a portion of the light emitting element 1 corresponding to the photosensitive chip 31. The mouse photoelectric detection device.

[0013]

[Embodiment of the invention]

 As shown in FIGS. 6 to 9, the present invention provides a kind of mouse photoelectric detecting device, which comprises at least one light emitting element 1, at least one disk 2 and at least one receiving element 3. Inclusive.

In the embodiment of the present invention, the light emitting element 1 is provided near the disk 2 and projects light on the disk 2.

The disk 2 is fixed to the rotation shaft 21 with its center hole, and rotates by receiving the transmission of one trackball 20. The center axis of the disk 2 is stretched toward the trackball, forming a rotational friction of the trackball, and therefore, when the trackball rotates, the disk 2 rotates with it, and a plurality of transparent holes are formed around the outer periphery of the disk 2. The light portions 22 and the opaque portions 23 are alternately arranged.

The receiving element 3 is made of a light-transmitting material, is provided near the periphery of the disk 2, and is located at a position corresponding to the position of the light emitting element 1. A chip 31 is provided to receive a work beam projected from the light transmitting unit 22. A dihedral or tetrahedral surface 32 is formed around a portion of the light receiving surface of the receiving element 3 corresponding to the photosensitive chip 31, and a material that reflects light or absorbs light is coated on each of the slant surfaces 32. I have. Thereby, when the working beam is projected on the light receiving surface of the receiving element 3, the near light is reflected by each slope as shown in FIG. 8, whereby the encoder processes the interference phenomenon due to the diffusion of the near light. , You can get a certain signal.

When the disk 2 rotates, the light emitted from the light emitting element 1 is cut off by the shielding and transmission by the opaque portion 23 and the light transmitting portion 22 of the disk 2, and the working beam 11 is formed. When the working beam 11 comes into contact with the photosensitive chip 31, energy is generated, and when the disk 2 rotates continuously, a sine waveform is obtained on a waveform display and (0, 0), (0, 1) through a rectifying circuit. , (1,1) and (1,0) are obtained. FIG. 7 shows how these signals are generated.

Please refer to FIG. When the disk 2 rotates, the light emitted from the light emitting element 1 is divided by the shielding and transmission by the opaque portion 23 and the light transmitting portion 22 of the disk 2, and a sine waveform is obtained on the waveform display, and further rectified. Through the circuit, a square wave is obtained. Among them, the waveforms of D and D1 are theoretical sine waves and square waves, the waveforms of E and E1 are actual sine waves and square waves according to well-known techniques, and the waveforms of F and F1 are sine waves according to the present invention. Indicates waves and square waves.

As can be seen from FIGS. 8 and 9, when the working beam 11 is projected on the light receiving surface of the receiving element 3, nearby light that can diffuse and cause interference is reflected on each slope. Therefore, when the working beam 11 is not in contact with the photosensitive chip 31, the photosensitive chip 31 does not receive the interference light and generate energy. When the working beam 11 leaves, the energy is released smoothly, and the waveform generated on the photosensitive chip 31 is similar to E and E1. In this way, this encoder processes the interference phenomenon of near light and obtains a reliable signal.

As shown in FIG. 10, the light emitting surface of the light emitting device 1 of the present invention is provided with at least one pair of dihedral or tetrahedral surfaces 12 around a position corresponding to the photosensitive chip 31 of the receiving device 3. Thus, one or more bundles of working beams can be generated in the light source under control.

Another form of the disk 2 of the present invention is shown in FIG.

[0022]

[Effect of the invention]

 According to the present invention, when the working beam is projected on the light receiving surface of the receiving element 3, the near light is reflected by each slope, so that it is possible to prevent interference that may form the diffusion of the near light, and thus to ensure the reliability. Can get a good signal.

[Brief description of the drawings]

FIG. 1 is a perspective view of a known mouse photoelectric detection device.

FIG. 2 shows a known mouse photoelectric detection device obtained on a waveform display as the disk rotates continuously (0,
It is a generation display diagram of four signals of (0), (0, 1), (1, 1), and (1, 0).

FIG. 3 is a diagram showing interference light generated when light enters a receiving element in a known mouse photoelectric detection device.

FIG. 4 is a theoretical waveform diagram of a sine wave generated by a photosensitive chip obtaining a work beam of a light emitting element when a disc rotates and a square wave obtained through a rectifier circuit in a known mouse photoelectric detection device. .

FIG. 5 is a waveform diagram showing an actual value and an ideal value of a sine wave generated when a photosensitive chip receives a work beam of a light emitting element when a disk rotates in a well-known mouse photoelectric detection device.

FIG. 6 is a diagram illustrating an application of the present invention;

FIG. 7 shows (0,0), (0,1), (1,1), obtained on the waveform display when the disk of the present invention rotates continuously.
It is a generation display figure of four signals of (1, 0).

FIG. 8 is a view showing a beam path when a working beam is projected on a light receiving surface of a receiving element in the present invention.

FIG. 9 is a comparison diagram of a sine wave generated when a receiving element receives a working beam and its rectified square wave according to a known technique, the present invention, and the theory.

FIG. 10 is an external view of a light emitting device having four slopes and a receiving device according to the present invention.

FIG. 11 is a diagram showing another kind of disk of the present invention and a corresponding receiving element.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Light emitting element 11 Working beam 2 Disk 20 Trackball 21 Rotation axis 22 Translucent part 23 Opaque part 3 Receiving element 31 Photosensitive chip 32 Slope

Claims (3)

[Utility model registration claims] At least one light-emitting element, at least one disk, and at least one receiving element are included. One light-emitting element is provided in the vicinity of each disk, and the light-emitting element is provided. Light can be projected on the disk 2 and each disk 2
And a pair of adjacent photosensitive chips 31 are provided in each of the receiving elements 3 so that the photosensitive chips 31 receive an optical signal of a light beam transmitted through the disk 2. The mouse's photoelectric detection device,
At least one pair of dihedral or tetrahedral surfaces 32 is provided around a portion corresponding to the photosensitive chip 31 on the light receiving surface of each receiving element 3, and interference light generated by proximity light when a light beam reaches the light receiving surface of the receiving element 3 A mouse photoelectric detecting device having the above-mentioned configuration, which is capable of receiving an accurate signal by eliminating the phenomenon. 2. The mouse photoelectric detection device according to claim 1, wherein a light-reflecting substance or a light-absorbing substance is applied to the slope 32 of the light receiving surface of the receiving element 3. 3. The photoelectric detection of a mouse according to claim 1, wherein at least one set of two slopes or four slopes is formed around a portion of the light emitting element 1 corresponding to the photosensitive chip 31. device.