JP2001282458A - Optical scanning touch panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct a detection error without necessitating calibration. SOLUTION: In this optical scanning touch panel to make at least two optical scanning units 11a, 11b with a scan mirror, a light emitting part and a light receiving part face a coordinate surface on a substrate 10, to irradiate a retroreflector 12A with light 21 of the light emitting part by rotation of the scan mirror, to receive the reflected light via reflection of the scan mirror by the light receiving part, to detect optical scanning angles of an object 27 based on a light receiving signal and to calculate a coordinate position of the object 27 based on the detected angles θa, θb, a starting position and an end position of optical scanning are made clear by sticking non-reflection tapes 30as, 30ae, 30bs, 30be the reflectance of which are formed as smaller than that of the retroreflector 12A to the starting position and the end position of the optical scanning of the retroreflector 12A by the scan mirror and forming length L of the nonreffective tapes 30as, 30ae, 30bs, 30be in the optical scanning direction as equal to or less than the maximum length Lm in the optical scanning direction of the object 27.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a scan mirror,
At least two of the light scanning units including the light emitting unit and the light receiving unit face the coordinate plane, and each light scanning unit causes the light output from the light emitting unit to enter the retroreflector by reflection of the scan mirror, and The reflected light is received by the light receiving unit via the reflection of the scan mirror, and the light scanning angle of the object is detected based on the light receiving signal of the light receiving unit of each optical scanning unit, and the object is instructed based on the detected angle. The present invention relates to an optical scanning type touch panel for obtaining a position on a coordinate plane.

[0002]

2. Description of the Related Art Conventionally, this type of optical scanning type touch panel has been configured as shown in FIG. That is, the optical scanning units 11a and 11b are disposed at the upper corner and the lower corner of one side surface of the substrate 10 such as an optical filter, and the mounting side of the optical scanning units 11a and 11b is disposed on the front surface of the substrate 10. An elongated frame 14 is attached to the three sides excluding it, and a retroreflector 12 is attached inside the frame 14, and start position detection light receiving units 13 a and 13 b are provided at positions slightly apart from both ends of the retroreflector 12. Is attached.

In the optical scanning unit 11a, as shown in FIG. 22, a fixed portion (not shown) of a unit support plate 15 is fixed to the substrate 10 with an adhesive or the like, and a substantially L-shaped support integrated with the fixed portion. The unit main body 17 is mounted on the portion 16 and attached so that the angle can be adjusted. Unit body 17
The lower surface has a substantially L-shaped groove 18 which is loosely fitted to the support portion 16, and a light emitting element 19 such as a semiconductor laser device and a light receiving element 20 are housed therein. A refracting prism 22 for refracting a laser beam (hereinafter simply referred to as light) 21 output from the element 19, a prism 24 having a half mirror 23 for transmitting the refracted light 21, and a scan mirror 25 are provided. The scan mirror 25 is rotatably provided by a pulse motor 26. The optical scanning unit 11b has the same configuration as the optical scanning unit 11a.

[0004] Each of the optical scanning units 11a and 11b operates as follows. Light 21 output from the light emitting element 19 is refracted by the refraction prism 22, passes through the half mirror 23 and the prism 24, is reflected by the scan mirror 25, and enters the retroreflector 12. In the retroreflector 12, the light returns substantially along the same optical path as the incident light, is reflected by the scan mirror 25, is reflected and refracted by the half mirror 23 of the prism 24, and is received by the light receiving element 20. The light 21 is scanned by an angle θ (for example, about π / 2 radians (= 90 degrees)) by the rotation of the scan mirror 25 by the pulse motor 26. If the target object 27 is present in the optical scanning area, the light 21 is blocked by the target object 27, so that the light scanning angle θ of the target object 27 is obtained based on the light receiving signal of the light receiving element 20. Assuming that the optical scanning angles of the object 27 obtained by the optical scanning units 11a and 11b are θa and θb,
By applying θb to the principle of triangulation, the position coordinates of the target object 27 on a coordinate plane formed on the substrate 10 can be obtained.

[0005] The optical scanning angles θa, θ of the object 27 described above.
b is obtained by the following equations (1) and (2). θa = Ka × (measured number of ta) (1) θb = Kb × (measured number of tb) (2) In equations (1) and (2), ta and tb are determined by the optical scanning units 11a and 11b. Object 27 from the start of optical scanning
Represents the period until the detection of. This ta (or tb) is obtained based on the light receiving signal of the light receiving element 20. That is, the light receiving signal (1) corresponding to the reflected light from the retroreflector 12 as shown in FIG. 23 (a) and the start position detecting light receiving unit 13a (or 13b) as shown in FIG. 23 (b). And the received signal (2) corresponding to the reflected light. In FIG. 23A, A is a portion of a synchronization signal corresponding to the primary reflected light of the scan mirror 25, and B is an object 27.
Represents a signal portion corresponding to the position of. The “number of measurements of ta” and “the number of measurements of tb” are measurement clocks (hereinafter simply referred to as clocks) in the detection periods ta and tb.
Represents the number of measurements. Also, Ka and Kb are the optical scanning units 1
The optical scanning angle per measurement clock in units 1a and 11b is expressed by the following equations (3) and (4). Ka = (angle of one scanning cycle) / maximum measurement number of period Ta ... (3) Kb = (angle of one scanning cycle) / maximum measurement number of period Tb ... (4) In equations (3) and (4), The angle of one scanning cycle is, for example, π / 2 (radian), and the periods Ta and Tb are shown in FIG.
As shown in FIG. 3B, the optical scanning units 11a and 11b
Represents a scanning period (hereinafter, referred to as one scanning cycle) per one reflection surface scanned by the rotation of the scan mirrors 25, 25,
"Maximum number of measurements in period Ta", "Maximum number of measurements in period Tb"
Represents the maximum measured number of clocks in the periods Ta and Tb.

The coordinates (Px, Py) of the position P on the coordinate plane formed on the substrate 10 are obtained by the principle of triangulation as schematically shown in FIG. That is,
Assuming that the length from the light scanning unit 11a to the light scanning unit 11b on the substrate 10 is L, the relationship Py = Px · tan θa (5) Py = (L−Px) · tan θb (6) holds. Px = {tan θb / (tan θa + tan θb)} · L (7) Py = {tan θa · tan θb / (tan θa + tan θb)} · L (8)

[0007]

However, the conventional example has a problem that a detection error occurs due to the following factors (a), (b) and (c). (A) Since the start position detection light-receiving units 13a and 13b and the retroreflector 12 are separately mounted on the substrate 10, if the position accuracy of the start position detection light-receiving units 13a and 13b with respect to the retroreflector 12 decreases, detection is performed. Optical scanning angles θa, θ
An error occurs in b. (B) If a synchronization deviation occurs due to a rotation variation or a temporal change of the motor 26 that rotates the scan mirror 25, an error occurs in the detected optical scanning angles θa and θb. (C) The optical scanning angles θa, θ detected by the variation or aging of the measuring oscillator (for example, a voltage-controlled oscillator) for obtaining the number of measurements in the detection periods ta and tb in the equations (1) and (2).
An error occurs in b. Further, in order to correct the detection errors shown in (a), (b), and (c) above, calibration using software (the position coordinates obtained by calculation and the object 27) is performed.
To adjust the position coordinates actually instructed), but it is necessary to set the calibration mode again, measure the position deviation, and enter the corresponding offset value, so complicated operations are required There was a problem of becoming.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems. Even when a detection error occurs, the detection error can be reduced without performing a complicated operation such as setting a calibration mode and inputting an offset value. It is an object of the present invention to provide an optical scanning type touch panel that can automatically correct the touch panel.

[0009]

According to a first aspect of the present invention, at least two optical scanning units each including a scan mirror, a light emitting unit, and a light receiving unit face a coordinate plane. The output light is incident on the retroreflector by the reflection of the scan mirror, and the light reflected by the retroreflector is received by the light receiving unit via the reflection of the scan mirror. Optical scanning angle detecting means for detecting the optical scanning angle of the object in the corresponding optical scanning range based on the light receiving signal of the object, on the coordinate plane designated by the object based on the detection angle of the optical scanning angle detecting means In the optical scanning type touch panel for determining the position of the position, the position detection object having a reflectance different from the reflectance of the retroreflector at the start position and the end position of the optical scanning by the scanning mirror of the retroreflector. And characterized by being fixed to.
In such a configuration, a position detection object having a reflectance different from the reflectance of the retroreflector is fixedly integrated at the start position and the end position of the optical scanning by the scan mirror of the retroreflector, and thus integrated. The start position and the end position of the optical scanning can be clarified. For this reason, even if a synchronization deviation occurs due to a rotation variation or a change over time of the motor that rotates the scan mirror, or a clock frequency fluctuates due to a variation or a change over time of the measurement oscillator, the clarified start position and end position are used. The detection error can be automatically corrected.

According to a second aspect of the present invention, in the first aspect of the present invention, a position detecting object for detecting a start position and an end position of the optical scanning can be easily formed, and the start position and the end position of the optical scanning are determined. In order to be able to more clearly distinguish from the object position, the position detection object is attached to the start position and end position of the retroreflector, and the reflectance is formed smaller than the reflectance of the retroreflector The length of the non-reflective tape in the optical scanning direction is formed to be equal to or less than the maximum length of the object in the optical scanning direction.

According to a third aspect of the present invention, in order to simplify the structure of the optical scanning angle detecting means in the second aspect of the present invention, the optical scanning angle detecting means includes a primary light source of a scan mirror based on a light receiving signal of a light receiving section. First to separate synchronization signal corresponding to reflected light
A separation circuit, a second separation circuit that separates signals corresponding to a start position, an end position, and an object position of optical scanning from light reception signals of the light receiving unit; and a synchronization signal separated by the first separation circuit. A gate signal generation circuit for generating a start gate signal and a stop gate signal corresponding to a start position and an end position of optical scanning, a signal separated by the second separation circuit, and a start gate signal and a stop generated by the gate signal generation circuit A gate circuit that outputs a start signal corresponding to a start position of optical scanning, first and second stop signals corresponding to an object position and an end position of optical scanning based on the gate signal, and an output from the gate circuit. A first and a second measurement counters which are reset by a start signal and start counting clocks and stop counting by first and second stop signals output from a gate circuit. The first is constituted by a calculating means for calculating a light scanning angle of the object based on the count value of the second measurement counter.

According to a fourth aspect of the present invention, in order to simplify the configuration of the gate circuit in the third aspect of the invention, the gate circuit is separated by the second separation circuit by the start gate signal generated by the gate signal generation circuit. A first gate circuit for extracting a start signal from the separated signals, and a second gate circuit for extracting a second stop signal from the signals separated by the second separation circuit by the stop gate signal generated by the gate signal generation circuit. A filter for removing a pulse signal having a pulse width smaller than a set value from a signal separated by the second separation circuit and outputting the same, and a logic of a second stop signal extracted by the second gate circuit and an output signal of the filter. Sum signal is first
And a third gate circuit that outputs a stop signal.

According to a fifth aspect of the present invention, in the first aspect of the present invention, a position detecting object for detecting the start position and the end position of the optical scanning can be easily formed, and the start position and the end position of the optical scanning can be determined. In order to be able to be more clearly distinguished from the object position, the position detecting object is fixed to the start position and the end position of the retroreflector, and the reflectivity is formed to be larger than the reflectivity of the retroreflector. The length of the mirror in the optical scanning direction is set to be equal to or less than the maximum length of the object in the optical scanning direction.

According to a sixth aspect of the present invention, in order to simplify the configuration of the light scanning angle detecting means in the fifth aspect of the present invention, the light scanning angle detecting means is changed from the light receiving signal of the light receiving section to the primary position of the scan mirror. A first separation circuit that separates a synchronization signal corresponding to the reflected light, a signal corresponding to a start position and an end position of optical scanning, and a signal corresponding to a target position of the optical scanning from light reception signals of the light receiving unit A second separation circuit; and a calculation unit configured to calculate an optical scanning angle of the object based on the synchronization signal, the start position signal, the end position signal, and the object position signal separated by the first and second separation circuits. I do.

According to a seventh aspect of the present invention, in order to simplify the configuration of the arithmetic means in the sixth aspect of the present invention, the arithmetic means is provided with a synchronizing signal, a start position signal and an object signal separated by the first and second separation circuits. First calculating means for calculating a light scanning period from a light scanning start position to a target object position based on the object position signal;
Second calculating means for calculating an optical scanning period from a start position to an end position of optical scanning based on the synchronization signal, the start position signal, and the end position signal separated by the first and second separation circuits;
And a third calculating means for calculating the optical scanning angle of the object based on the calculated values of the first and second calculating means.

According to an eighth aspect of the present invention, in the optical scanning type touch panel, the retroreflective body is formed integrally with the main body portion for the start position and the end position of the optical scanning. Wherein each optical scanning unit comprises first and second light receiving / emitting sections for emitting and receiving first and second scanning lights having different optical axes, and the first scanning light is recursively scanned by a scan mirror. The second scanning light is incident on the main body of the reflector, and the second scanning light is incident on the projection of the retroreflector by the scan mirror.
In such a configuration, the starting position of optical scanning by the scanning mirror of the retroreflector is formed in a protruding portion integrally provided from the main body of the retroreflector, so that the starting position and the end of optical scanning are provided. The position can be clarified. For this reason, even if a synchronization deviation occurs due to a rotation variation or a change over time of the motor that rotates the scan mirror, or a clock frequency fluctuates due to a variation or a change over time of the measurement oscillator, the clarified start position and end position are used. The detection error can be automatically corrected.

According to a ninth aspect of the present invention, in order to further improve the detection accuracy of the end position in the invention of the eighth aspect, the second scanning light of each optical scanning unit is provided with a plurality of end position protrusions of the retroreflector. So that only the corresponding projection is incident
The distance from the scan mirror to the corresponding protrusion is formed shorter than the distance from the scan mirror to the non-supporting protrusion.

According to a tenth aspect of the present invention, in order to simplify the configuration of the light scanning angle detecting means, the light scanning angle detecting means is provided in the light receiving signal of the first light receiving / emitting section. A first separating circuit for separating a signal corresponding to the position of the object to be scanned from the light source; a synchronization signal corresponding to the primary reflected light of the scan mirror from the light receiving signals of the second light receiving and emitting unit; , Which separates the signal corresponding to the end position from the second
A separation circuit, and a gate signal generation circuit that generates a start gate signal and a stop gate signal corresponding to the start position and the end position of optical scanning based on the synchronization signal, the start position signal, and the end position signal separated by the second separation circuit. A first measurement counter that counts clocks using the start gate signal generated by the gate signal generation circuit as a reset signal and stops counting using the target position signal separated by the first separation circuit as a stop signal; A second measurement counter that counts a clock by using a start gate signal generated by the signal generation circuit as a reset signal and stops counting by using a stop gate signal generated by the gate signal generation circuit as a stop signal, and a first and second measurement Computing means for computing the light scanning angle of the object based on the count value of the counter.

According to an eleventh aspect of the present invention, in the optical scanning type touch panel, the retroreflector is integrally formed with the main body for the start position and the end position of the optical scanning. The scanning mirror of each optical scanning unit includes a plurality of reflecting surfaces that reflect light output from the light emitting unit to be first and second scanning lights having different optical axes. The second scanning light is incident on the main body of the retroreflector, and is incident on the protrusion of the retroreflector. In such a configuration, the starting position and the ending position of the optical scanning by the scanning mirror of the retroreflector are formed on the protruding portion integrally projecting from the main body of the retroreflector.
The start position and the end position of optical scanning can be clarified. For this reason, even if a synchronization deviation occurs due to a rotation variation or a change over time of the motor that rotates the scan mirror, or a clock frequency fluctuates due to a variation or a change over time of the measurement oscillator, the clarified start position and end position are used. The detection error can be automatically corrected.

According to a twelfth aspect of the present invention, in order to further increase the accuracy of detecting the end position, the scanning light of each optical scanning unit is controlled by the scanning light of the plurality of end position projections of the retroreflector. So that only the corresponding protrusion is incident
The distance from the scan mirror to the corresponding protrusion is formed shorter than the distance from the scan mirror to the non-supporting protrusion.

The invention of claim 13 is the invention of claim 11 or 12
In the invention of the first aspect, in order to simplify the configuration of the optical scanning angle detecting means, the optical scanning angle detecting means is used to separate a synchronization signal corresponding to the primary reflected light of the scan mirror from the light receiving signal of the light receiving section. A separating circuit, a second separating circuit that separates signals corresponding to a start position, an object position, and an ending position of optical scanning from the light receiving signals of the light receiving unit; and a synchronization signal separated by the first and second separating circuits. A stop signal generating circuit for generating first and second stop signals corresponding to a start position and an end position of optical scanning based on a start position signal, an object position signal, and an end position signal; The first and second measurement counters, which start counting clocks using the synchronization signal as a reset signal and stop counting with the first and second stop signals generated by the stop signal generation circuit, are separated by the first separation circuit. Sync A third measurement counter that starts counting clocks using the signal as a reset signal, stops counting using the object position signal separated by the second separation circuit as a third stop signal, and a first measurement counter based on the light receiving signal of the light receiving unit. , An optical scanning period identification circuit for identifying which scanning light of the second scanning light the optical scanning is performed, and an optical scanning period identification circuit inserted before the first, second, and third measurement counters. When it is identified as the light scanning period of the first scanning light, the reset signal and the first and second stop signals supplied to the first and second measurement counters are enabled, and the light scanning period identification circuit detects the second scanning light. When it is identified as the light scanning period, an enable control circuit that enables the reset signal and the third stop signal supplied to the third measurement counter, and a target based on the count values of the first, second, and third measurement counters Constituted by a calculating means for calculating a light scanning angle.

According to a fourteenth aspect of the present invention, in the thirteenth aspect, the light scanning period identification circuit integrates the light receiving signal of the light receiving section so as to simplify the configuration of the light scanning period identification circuit and the enable control circuit. An output circuit, a half-period delay circuit for delaying the output signal of this integration circuit by a half-period of optical scanning, and latching the output signal of this half-period delay circuit with the synchronizing signal separated by the first separation circuit. An enable control circuit comprising a latch circuit, a three-period delay circuit for delaying the signal latched by the latch circuit for three periods of optical scanning, and an inverter for inverting and outputting the output signal of the three-period delay circuit A first enable control circuit that enables a reset signal to the first and second measurement counters and a first and second stop signal by an output signal of the three-cycle delay circuit; Reset signal by the force signal to the third measurement counter is composed of a second enable control circuit the third stop signal to enable.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of an optical scanning type touch panel according to the present invention will be described with reference to the drawings. FIG.
To FIG. 7 show a first embodiment of the present invention,
In FIG. 1, the same parts as those in FIG. FIG.
In the figure, 10 is a substrate, 11a and 11b are optical scanning units, 21 and 21 are light (for example, laser light) output from the light emitting elements 19 and 19 of the optical scanning units 11a and 11b, and 27 is an object.

On the front surface of the substrate 10, an elongated frame 14A is mounted on three sides excluding the mounting side of the optical scanning units 11a and 11b, and a retroreflector 12A is mounted inside the frame 14A. I have. Both ends of the frame 14A and the retroreflector 12A are formed in a shape in which both ends of the frame 14 and the retroreflector 12 of FIG. 19 are extended to the positions of the start position detection light receiving units 13a and 13b. Inside the retroreflector 12A, a position detection object is set at a position corresponding to the start position (θ ≒ 0) and the end position (θ ≒ π / 2 radian) of the optical scanning of the optical scanning units 11a and 11b. Tapes 30as and 30bs and non-reflective tapes 30ae and 30
be is stuck. The anti-reflection tape 30as,
30bs, 30ae, and 30be are formed to have a reflectance smaller than that of the retroreflector 12A, and have a length L (for example, 2 mm) in the light scanning direction that is the maximum length Lm (in the light scanning direction) of the object 27. (For example, 5 mm) or less.

Reference numeral 28a denotes an optical scanning angle detecting means for detecting an optical scanning angle θa of the object 27 in a corresponding optical scanning range based on a light receiving signal of the light receiving element 20 of the optical scanning unit 11a. The light scanning angle detecting means 28a
2, an A / V (current / voltage) conversion circuit 31, a synchronization separation circuit 32 as an example of a first separation circuit,
Amplification circuit 33, A / D (analog / digital) conversion circuit 34 as an example of a second separation circuit, start gate signal generation circuit 35, stop gate signal generation circuit 36, gate circuit 37, first and second measurement counters 38 , 39 and an MPU (microprocessor unit) 40 as an example of an arithmetic means.

Reference numeral 28b denotes an optical scanning angle detecting means for detecting the optical scanning angle θb of the object 27 in the corresponding optical scanning range based on the light receiving signal of the light receiving element 20 of the optical scanning unit 11b. The detection means 28b
A V conversion circuit 31, a synchronization separation circuit 32, an amplification circuit 33,
A / D conversion circuit 34, start gate signal generation circuit 3
5, stop gate signal generation circuit 36, gate circuit 3
7, the configuration up to the first and second measurement counters 38 and 39 is the same as that of the corresponding circuit of the optical scanning angle detecting means 28a, and the MPU 40 controls the MP of the optical scanning angle detecting means 28a.
Shared with U40.

The A / V conversion circuit 31 converts a current corresponding to the light receiving energy of the light receiving element 20 of the optical scanning unit 11a into a voltage. The sync separation circuit 32 converts the output signal of the A / V conversion circuit 31 into a slice level SL.
1 and separates a synchronization signal corresponding to the primary reflected light of the scan mirror 25. The amplification circuit 33 is connected to the A
Amplifying the output signal of the V conversion circuit 31, the A / D conversion circuit 34 compares the output signal of the amplification circuit 33 with the slice level SL2, and corresponds to the start position, the end position, and the object position of the optical scanning. Separate signals. The start gate signal generation circuit 35 generates a pulse signal having a constant width w1 based on the synchronization signal separated by the synchronization separation circuit 32, delays the generated pulse signal by a predetermined time, and moves the pulse signal to a start position of optical scanning. Generate a corresponding start gate signal. The stop gate signal generation circuit 36 has a constant width w based on the synchronization signal separated by the synchronization separation circuit 32.
The second pulse signal is generated, and the generated pulse signal is delayed by a predetermined time to generate a stop gate signal corresponding to the end position.

The gate circuit 37 has negative logic AND gates 41 and 42 as an example of first and second gate circuits.
, A filter 43, and an OR gate 44 of negative logic as an example of a third gate circuit.

The AND gate 41 extracts a start signal corresponding to a start position from the signals separated by the A / D conversion circuit 34, based on the start gate signal generated by the start gate signal generation circuit 35. The AND gate 42 generates the A / A signal according to the stop gate signal generated by the stop gate signal generation circuit 36.
A second stop signal corresponding to the end position is extracted from the signals separated by the D conversion circuit.

The filter 43 is, as shown in FIG.
It comprises a shift register 45, a positive logic AND gate 46, a negative logic AND gate 47, and a D-FF (D flip-flop) 48. The pulse width is set from among the signals separated by the A / D conversion circuit 34. A pulse signal having a value of less than 2 ms (2 ms) is removed and output. The set value of 2 ms is the maximum length Lm of the object 27 in the light scanning direction.
Is a value corresponding to.

The OR gate 44 is connected to the second stop signal extracted by the AND gate 42 and the filter 4.
3 is output as a first stop signal.

The first measurement counter 38 is reset by a start signal output from the AND gate 41, starts counting clocks (not shown), and stops counting by a first stop signal output from the OR gate 44. .
The second measurement counter 39 is reset by a start signal output from the AND gate 41 and starts counting clocks, and stops counting by a second stop signal output from the AND gate 42.

The MPU 40 includes count values C1a and C2a of the first and second measurement counters 38 and 39 of the light scanning angle detection means 28a, and first and second measurement counters 38 of the light scanning angle detection means 28b. 39 count values C1b, C2
Based on b, the optical scanning angles θa and θb of the object 27 are calculated using the following equations (1A) and (2A). θa = Ka × C1a (1A) θb = Kb × C1b (2A) In equations (1A) and (2A), C1a and C1b represent the detection of the object 27 from the start of the optical scanning by the optical scanning units 11a and 11b. Detection period T1a, T1b required until time
Corresponds to the number of clocks corresponding to. Further, Ka and Kb represent the light scanning angle per unit clock, and the following equation (3A)
(4A). Ka = (angle of one scanning cycle) / C2a ... (3A) Kb = (angle of one scanning cycle) / C2b ... (4A) In equations (3A) and (4A), C2a and C2b end from the start of optical scanning. This corresponds to the number of clocks corresponding to the periods T2a and T2b up to the hour. One scanning cycle represents a scanning period per one reflection surface scanned by the rotation of the scan mirrors 25, 25 of the optical scanning units 11a, 11b, and the "angle of one scanning cycle" is, for example, π / 2 (radian). .

Next, the operation of FIGS. 1 to 3 will be described with reference to FIGS. 4 to 7. Schematic operation (A), detection operation of optical scanning angles θa and θb (B), operation of calculating position coordinates of object 27 (C), operation when rotation of motor 26 fluctuates (D), one light The operation (E) when the object 27 approaches the end position of the other optical scanning in the scanning and the corresponding signal waveforms overlap will be described separately.

(A) Schematic operation (1) The light scanning units 11a and 11b
Lights 21 and 21 output from 9 and 19 are scan mirror 2
The light 21, 21 that is incident on the retroreflector 12 </ b> A through the mirrors 5, 25 and is reflected by the retroreflector 12 </ b> A is received by the light receiving elements 20, 20 via the scan mirrors 25, 25. (2) Scan mirror 2 by pulse motors 26, 26
The light beams 21 are scanned by a predetermined angle θ (for example, about π / 2 radians (= 90 degrees)) by the rotation of the light beams 5 and 25. If the target object 27 is present in the light scanning area, the light 21 is blocked by the target object 27.
Optical scanning angles θa, θ of the object 27 based on the received light signals
b is required.

(B) Detecting action of optical scanning angles θa and θb (1) The received light energy of the light receiving element 20 of the optical scanning unit 11a (or 11b) is calculated by the A / V conversion circuit 31 as shown in FIG. Is converted into an appropriate light receiving signal (voltage). When this light receiving signal is input to the synchronization separation circuit 32, the light reception signal corresponds to the primary reflected light of the scan mirror 25 as shown in FIG. 4B by comparison with the slice level SL1 by the synchronization separation circuit 32. The synchronization signal is separated.

(2) When the light receiving signal is amplified by the amplifier circuit 33 and input to the A / D conversion circuit 34, the signal is compared with the slice level SL2 by the A / D conversion circuit 34,
Signals corresponding to the optical scanning start position, end position, and object position as shown in FIG. 4E are separated from the received light signal. The signal represents a signal corresponding to the end position in the other optical scanning. That is, if the signal is a signal corresponding to the reflected light of the non-reflective tapes 30as, 30ae (or 30bs, 30be), the signal is
The signal is a signal corresponding to the reflected light of be (or 30ae).

(3) When the synchronization signal separated by the synchronization separation circuit 32 is input to the start gate signal generation circuit 35 and the stop gate signal generation circuit 36, the start gate signal generation circuit 35 generates the signal as shown in FIG. A pulse signal having a constant width w1 is generated from the synchronization signal, and a start gate signal obtained by delaying the generated signal by a predetermined time t1 is generated. In the stop gate signal generation circuit 36, as shown in FIG. A certain width w2 from the synchronization signal
And a start gate signal obtained by delaying the generated signal by a predetermined time t2.

(4) When the signal as shown in FIG. 4E separated by the A / D conversion circuit 34 is input to the filter 43, the pulse width of the filter 43 is set to 2 m.
Since the pulse signal less than s is removed, only the signal corresponding to the target object 27 as shown in FIG. That is, the anti-reflection tape 30a
Since the length L in the light scanning direction of s, 30bs, 30ae, 30be is formed smaller than the length Lm of the object 27 in the light scanning direction, the anti-reflection tapes 30as, 30bs, 3be
The pulse width of the pulse signal corresponding to the reflected light of 0ae and 30be becomes less than the set value 2ms, and the pulse width of the pulse signal corresponding to the reflected light of the object 27 becomes the set value 2ms.
As described above, only the signal corresponding to the object 27 is output. Next, a detailed description will be given with reference to FIGS.

(4-1) Among the signals, the pulse signal whose pulse width W is less than the set value of 2 ms is removed by the filter 43 as shown in (1) of FIG. That is, a clock whose cycle is 0.5 ms (millisecond) as shown in FIG. 5A and a pulse signal whose pulse width W is less than the set value 2 ms as shown in FIG. When input to the shift register 45, signals as shown in (c) to (g) of FIG. Therefore, the signal A output from the AND gate 47 continues at the H level as shown in FIG. 5 (1) (h), the D-FF 48 is not set, and the D-FF 4
The Q output of No. 8 also keeps the H level, and the signal of the pulse width W included in the input signal is removed.

(4-2) Of the signals, the pulse signal whose pulse width W is equal to or greater than the set value of 2 ms is shown in FIG.
As shown in (2), a signal having almost the same pulse width is obtained without being removed by the filter 43. That is, FIG.
When a clock having a cycle of 0.5 ms as shown in (a) and a pulse signal having a pulse width W of a set value of 2 ms or more as shown in FIG. From the Q5 output side, (c)-
A signal as shown in (g) is output. For this reason, the signal A output from the AND gate 47 becomes L level for one clock cycle as shown in FIG.
48 is set, and the D-FF 48 is reset at the rising edge of the signal B output from the AND gate 46 shown in FIG. A pulse signal having a pulse width substantially equal to the pulse width W of the input signal is obtained.

(5) When a start signal as shown in FIG. 4F is output from the AND gate 41 in response to the input of the start gate signal in FIG. 4C and the signal in FIG. The first and second measurement counters 38 and 39 are reset to start counting clocks.

(6) When a second stop signal as shown in FIG. 4G is output from the AND gate 42 in response to the input of the stop gate signal in FIG. 4D and the signal in FIG. With the two-stop signal, the second measurement counter 39 stops counting clocks, and the counted value becomes the clock number C2 corresponding to the period T2 from the start signal to the second stop signal.

(7) When the first stop signal as shown in FIG. 4I is output from the OR gate 44 by the second stop signal in FIG. 4G and the filter output signal in FIG. The first measurement counter 38 stops counting clocks at the first signal of the one stop signal, and the count value becomes the clock number C1 corresponding to the period T1 from the start signal to the stop signal.

(8) The MPU 40 first calculates the count values C2a and C2b obtained by the second measurement counters 39 and 39 of the optical scanning angle detection means 28a and 28b according to the above equations (3A) and (4A).
And Ka (= (angle of one scanning cycle) / C2a)
And Kb (= (angle of one scanning cycle) / C2b). Then, the count values C1a and C1b of the first measurement counters 38 and 38 of the optical scanning angle detecting means 28a and 28b are calculated by the above equations (1A) and (2A). ), And θa (= Ka × C1a)
And θb (= Kb × C1b). Here, the count value C
1a and C1b denote the count values of the count value C1 of (7) in the optical scanning angle detecting means 28a and 28b, respectively.
Reference numerals 2a and C2b denote the count values of the count value C2 in (6) in the optical scanning angle detection means 28a and 28b.

(C) Function for calculating position coordinates of object 27 (1) The MPU 40 operates in the same manner as in the prior art (B).
The target 2 based on the light scanning angles θa and θb obtained in (8)
7 are calculated (Px, Py). That is, the optical scanning angles θa and θb obtained in (B) and (8) are applied to the above equations (7) and (8), and Px [= 〔tan θb / (t
an θa + tan θb)｝ · L] and Py [= ｛tan θ
a · tan θb / (tan θa + tan θb)｝ · L]
Ask for.

(D) Operation when the rotation of the motor 26 fluctuates (1) The light receiving signal when the rotation speed of the motor 26 is standard is shown in FIG. The signal is as shown in FIG. 6B, and the light receiving signal when the rotation speed is lower than the standard is as shown in FIG. FIG.
(A), (b), and (c), T1, T1f, and T1s
Represents a period from the start position to the target position, and T2, T
2f and T2s represent a period from the start position to the end position. FIG. 6D shows, as a comparative example, a conventional example in which calibration is required when the rotation of the motor 26 fluctuates. T1p and T2p indicate the start position and the end position by counting clocks from a synchronization signal. And a period from the position of the synchronization signal to the start position and a period from the position of the synchronization signal to the end position.

(2) In the case of FIG. 6B where the rotation speed of the motor 26 is faster than the standard, the following equation (9) is established from the relationship of T1f / T1 = T2f / T2. T1f = T2f × (T1 / T2) (9) That is, T2f (C2a, C2b at a high rotation speed)
By accurately measuring the time period corresponding to C1a and applying it to equation (9) and correcting it, an accurate T1f (the period corresponding to C1a and C1b when the rotation speed is high) can be obtained, and the calibration can be performed. No longer needed.

(3) In the case of FIG. 6C in which the rotation speed of the motor 26 is lower than the standard, the following equation (10) is established from the relationship of T1s / T1 = T2s / T2. T1s = T2s × (T1 / T2) (10) That is, T2s (C2a and C2b when the rotation speed is low)
By accurately measuring the period corresponding to (1) and correcting it by applying it to the equation (10), an accurate T1s (period corresponding to C1a and C1b when the rotational speed is slow) can be obtained. No longer needed.

(4) On the other hand, in the case of FIG. 6D showing the conventional example, a period T1p from the position of the synchronization signal to the start position is used.
And the period T2p from the position of the synchronization signal to the end position are determined based on the start position and the end position which are pseudo-determined by counting clocks from the synchronization signal.
When the rotation speed of the motor 26 fluctuates, the start position and the end position fluctuate according to the fluctuation, and the periods T1p and T2p also fluctuate. Therefore, calibration is necessary.

(E) Operation in the case where the object 27 approaches the end position of the other optical scanning in one optical scanning and the corresponding signal waveforms overlap, one of the two optical scanning units 11a and 11b (for example, In the optical scanning of the scanning unit 11a), of the signals included in the light receiving signal, the signal corresponding to the object 27 and the signal corresponding to the end position of the other (for example, the optical scanning unit 11b) by the optical scanning are shown in FIG. When the signals completely overlap as shown in FIG. 7A or partially overlap as shown in FIG. 7B, the signal corresponding to the end position of the other optical scanning (ie, the non-target optical scanning) is filtered. The signal is not removed at 43 but is processed as a signal corresponding to the object 27 (a signal including the signal).

FIGS. 8 to 11 show a second embodiment of the present invention. In FIGS. 8 and 9, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals. 8, 10 is a substrate,
11a and 11b are optical scanning units, 12A is a retroreflector, 14A is a frame, and 21 and 21 are optical scanning units 1.
Light (eg, laser light) output from 1a, 11b, 27
Is a target object, and 50as, 50bs, 50ae, and 50be are mirrors as an example of an object for position detection.

The mirrors 50as and 50bs and the mirror 50ae,
50be is an optical scanning start position (θ ≒) of the optical scanning units 11a and 11b inside the retroreflector 12A.
0) and the end position (θ ≒ π / 2 radians), and their reflection surfaces are arranged perpendicular to the optical axes of the corresponding scanning lights 21, 21. The mirrors 50as and 50b
s, 50ae, and 50be are formed so that the reflectivity is greater than that of the retroreflective body 12A, and the length L (for example, 2 mm) in the light scanning direction is the maximum length Lm (in the light scanning direction) of the object 27. (For example, 5 mm) or less.

Reference numeral 51a denotes an optical scanning angle detecting means for detecting an optical scanning angle θa of the object 27 in a corresponding optical scanning range based on a light receiving signal of the light receiving element 20 of the optical scanning unit 11a. The light scanning angle detecting means 51a
9, an A / V conversion circuit 31, a synchronization separation circuit 32 as an example of a first separation circuit, an amplification circuit 33,
It comprises an A / D conversion circuit 34 as an example of a second separation circuit and an MPU 58 as an example of an operation means.

Reference numeral 51b denotes an optical scanning angle detecting means for detecting an optical scanning angle θb of the object 27 in a corresponding optical scanning range based on a light receiving signal of the light receiving element 20 of the optical scanning unit 11b. The detecting means 51b
A V conversion circuit 31, a synchronization separation circuit 32, an amplification circuit 33,
The configuration up to the A / D conversion circuit 34 is the same as the corresponding circuit of the optical scanning angle detecting means 51a, and the MPU 58 is shared with the MPU 58 of the optical scanning angle detecting means 51a.

The sync separation circuit 32 compares the output signal of the A / V conversion circuit 31 with a slice level SL1,
A synchronization signal corresponding to the primary reflected light of the scan mirror 25 and a signal corresponding to the start position and the end position of the optical scanning are separated. The A / D conversion circuit 34 includes the amplification circuit 33
The A / V conversion circuit 31 amplifies the output signal of the A / V conversion circuit 31 and compares it with the slice level SL2 to separate the signal corresponding to the target position of the optical scanning.

The MPU 58 includes T1 and T2 registers 52 and 53 for storing the count value of the clock and T1 and T2 flag registers (hereinafter simply referred to as T1 and T2) for storing the flags.
Write a flag. ) 54 and 55, and each of the optical scanning angle detecting means 51a and 51b has the following functions (1), (2) and (3). (1) The optical scanning time T1 from the optical scanning start position to the object position is calculated based on the synchronization signal, the start position signal, and the object position signal separated by the synchronization separation circuit 32 and the A / D conversion circuit 34. The first arithmetic function to be performed. (2) The light scanning time T2 from the start position to the end position of the optical scanning is calculated based on the synchronization signal, the start position signal and the end position signal separated by the sync separation circuit 32 and the A / D conversion circuit 34. Second arithmetic function. (3) The light scanning angle θ (θa of the object 27 based on the calculated values T1 and T2 obtained by the first and second calculation functions (1) and (2).
Or a third calculation function for calculating θb).

Next, the operation of FIGS. 8 and 9 will be described with reference to FIGS.
1 will be described together. 1 and 2 will not be described. (1) The light receiving energy of the light receiving element 20 of the optical scanning unit 11a is converted into a light receiving signal (voltage) as shown in FIG. When this light receiving signal is input to the sync separation circuit 32, the sync signal is compared with the slice level SL1 by the sync separation circuit 32, and the sync signal as shown in FIG. Are separated.

(2) When the light receiving signal is amplified by the amplifier circuit 33 and input to the A / D conversion circuit 34, the A / D conversion circuit 57 compares the received light signal with the slice level SL2.
A signal corresponding to the target position of the optical scanning as shown in FIG. 10C is separated from the light receiving signal.

(3) When signals as shown in FIGS. 10 (b) and 10 (c) are input to the MPU 58, the MPU 58 operates based on its arithmetic functions (1) and (2) as shown in the flowchart of FIG. do. In the initial state, T1, T2
Registers 52 and 53 are cleared and T
1. The T2 flags 54 and 55 are in a reset state.

(3-1) Optical scanning unit 11a (or 1)
When the optical scanning according to 1b) is started, the signals input from the sync separation circuit 32 and the A / D conversion circuit 34 are read, and "start signal present?" Is determined. When a signal corresponding to the start position appears in the read signal, "Start signal present?"
ES (hereinafter simply referred to as Y), and the T1 flag 5
4 is set and a return is made.

(3-2) When the T1 flag 54 is set, the "T1 flag set?" Becomes Y, and the signals input from the synchronization separation circuit 32 and the A / D conversion circuit 34 are read, and the "object existence" ? " When a signal corresponding to the target object 27 does not appear in the read signal, “target object present?” Becomes NO (hereinafter simply referred to as N), and “T
1 register value = T2 register value? Is determined. At the beginning of optical scanning, the numerical value of the T1 register 52 and the T2 register 5
3 are equal, "T1 register value = T2 register value?" Becomes Y, and T1, T2 registers 52, 53
"+1" is added to the numerical value of "." Immediately after the start of optical scanning, the signal corresponding to the end position does not appear in the read signal. Therefore, T1, T
"+1" to the two registers 52 and 53 is
2 and continues until an "end signal" appears in the signal input from the output side of the A / D conversion circuit 34.

(3-3) When the optical scanning progresses and a signal corresponding to the object 27 appears in the read signal, “object present?” Becomes Y, and the numerical value of the T2 register 53 is “+1”.
Is added and a return is made.

(3-4) When the light scanning further advances and the signal corresponding to the object 27 does not appear in the read signal,
“Object present?” Becomes N, and “T1 register value = T2 register value?” Is determined. According to the above (3-3), T2
Since the numerical value of the register 53 is larger than the numerical value of the T1 register 52, “T1 register value = T2 register value?” Becomes N, and the numerical value of the T2 register 53 becomes “+”
"1" is added, and "end signal present?" Is determined. When this “end signal present?” Is N, the return is made.
“+1” to the T2 register 53 continues until an “end signal” appears in the read signal.

(3-5) When the optical scanning further advances and a signal corresponding to the end position appears in the read signal, "End signal present?" Becomes When the T2 flag 55 is set, "T2 flag set?"
1. After reading the numerical values of the T2 registers 52 and 53, the numerical values are cleared, and the T1 and T2 flags 54 and 55 are reset to return to the initial state.

(3-6) T read in the above (3-5)
1, assuming that the numerical values of the T2 registers 52 and 53 are C1 and C2, the C1 and C2 correspond to the object position from the signals corresponding to the start position shown in FIGS. This corresponds to the number of clocks in a period T1 until the signal and a period T2 from the signal corresponding to the start position to the signal corresponding to the end position. Therefore, C1 is the first MPU 58
C2 corresponds to the calculation result by the calculation function (1), and C2 is the MPU
58 corresponds to the calculation result by the second calculation function (2).

(4) Next, the third arithmetic function (3) of the MPU 58 obtains the light detection angles θa and θb of the object 27 in the light scanning of the light scanning units 11a and 11b. That is, for each of the optical scanning units 11a and 11b, the T1 and T2 registers 52 obtained in (3) above,
53 C1 and C2 are replaced by C1a and C2a, C1b and C2b
In other words, by the second arithmetic function (3) of the MPU 58,
By applying C2a and C2b to the above equations (3A) and (4A), Ka (= (angle of one scanning cycle) / C2a) and Kb
(= (Angle of one scanning cycle) / C2b), and then C
1a and C1b are applied to the above formulas (1A) and (2A),
θa (= Ka × C1a) and θb (= Kb × C1b) are obtained.

FIGS. 12 to 14 show a third embodiment of the present invention. In FIGS. 12 and 13, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals. In FIG.
B is a retroreflector fixed inside a frame (not shown), and 59a and 59b are optical scanning units. It is configured similarly to the optical scanning units 11a and 11b except that the optical scanning units 11a and 11b are provided. That is, the optical scanning unit 59a includes the first and second
The light scanning unit 59b includes first and second light emitting and receiving units 60b and 61b. 25a and 25b are the optical scanning units 59a and 5b.
9b is a scan mirror.

The retroreflector 12B is formed for the main body 62 formed for the position of the object for optical scanning, the protruding portions 63as and 63bs formed for the start position of the optical scanning, and for the end position. Protruding portions 63ae and 63be.

The first and second light receiving and emitting sections 60a and 61a of the optical scanning unit 59a include a light emitting element (not shown) and light receiving elements 64 and 65, respectively.
The first scanning light 66 output from the light emitting element a enters and reflects substantially perpendicularly to the mirror surface of the scan mirror 25a,
The second scanning light 67 output from the light emitting element of the second light receiving and emitting unit 61a is configured such that its optical axis intersects with the optical axis of the first scanning light 66 at an intersection angle θx as shown. As a result, the first scanning light 66 is incident on the reflecting surface of the main body 62 almost perpendicularly through the incident and reflected light of the scanning mirror 25a,
The reflected light is received by the light receiving element 64. Further, the second scanning light 67 is incident on the reflection surfaces of the protrusions 63as, 63be, 63ae almost perpendicularly through the incident and reflection of the scan mirror 25a, and the reflected light is received by the light receiving element 65.

The first and second light emitting / receiving sections 60b, 61b of the optical scanning unit 59b are configured in the same manner as the first and second light emitting / receiving sections 60a, 61a of the optical scanning unit 59a.
The first scanning light 68 output from the light emitting element of the first light receiving / emitting unit 60b is incident on the reflecting surface of the main body 62 almost perpendicularly through the incident / reflection of the scanning mirror 25b, and the reflected light is received by the light receiving element 64. Is done. The second scanning light 69 output from the light emitting element of the second light receiving / emitting unit 61b is
The projections 63bs, 63ae, 63 via the incoming reflection of 5b
Be incident on the reflection surface of be substantially perpendicularly, and the reflected light is received by the light receiving element 65.

Reference numeral 70a denotes a light scanning angle θ of the object 27 (not shown) in a corresponding light scanning range based on the light receiving signals of the light receiving elements 64 and 65 of the light scanning unit 59a.
It is an optical scanning angle detecting means for detecting a. As shown in FIG. 13, the optical scanning angle detection means 70a includes A / V conversion circuits 71 and 72, an amplification circuit 73, an A / D conversion circuit 74 as an example of a first separation circuit, and an example of a second separation circuit. , An A / D conversion circuit 75, a gate signal generation circuit 76, first and second measurement counters 78 and 79, and an MPU 80 as an example of arithmetic means.

Reference numeral 70b denotes an optical scanning angle detecting means for detecting the optical scanning angle θb of the object 27 in the corresponding optical scanning range based on the light receiving signals of the light receiving elements 64 and 65 of the optical scanning unit 59b. Scanning angle detecting means 70b
Are A / V conversion circuits 71 and 72, an amplification circuit 73, an A / D
The configuration of the conversion circuit 74, the A / D conversion circuit 75, the gate signal generation circuit 76, the first and second measurement counters 78 and 79 is the same as the corresponding circuit of the optical scanning angle detection means 70a, and the MPU 80 It is shared with the MPU 80 of the optical scanning angle detecting means 70a.

The A / D conversion circuit 74 compares the signal obtained by amplifying the output signal of the A / V conversion circuit 71 with the amplifying circuit 73 with a slice level SL2, and outputs a signal corresponding to the position of the object to be scanned. To separate. A / D conversion circuit 7
5 compares the output signal of the A / V conversion circuit 72 with a slice level SL1, and outputs a synchronization signal corresponding to the primary reflected light of the scan mirror 25, a signal corresponding to a start position and an end position of optical scanning. Is separated.

The gate signal generation circuit 76 is provided with the A /
Based on the synchronization signal separated by the D conversion circuit 75 and the signal corresponding to the start position, a start gate signal corresponding to the start position of the optical scanning is generated and output, and the A / A signal is output.
A stop gate signal corresponding to the optical scanning end position is generated and output based on the synchronization signal separated by the D conversion circuit 75 and the signal corresponding to the end position.

The gate signal generation circuit 76 is configured, for example, as shown in FIG. That is, A /
An inverter 111 for inverting the signal a output from the D conversion circuit 75, an OR gate 112 having the output signal of the inverter 111 as one input, and an OR gate 112
A monostable circuit (mono-multivibrator) that generates a generation pulse 1 having a pulse width t1 by using the output signal of the OR gate as a trigger, outputs the generated pulse 1 from the Q output side, and outputs the generated pulse 1 as a gate signal to the other input side of the OR gate 112 ) 113, a NAND gate 114 for outputting a signal obtained by inverting a logical product signal of the signal a and the creation pulse 1 as a start gate signal, and generating a creation pulse 2 having a pulse width t2 by using the start gate signal as a trigger to generate an inverted Q output. Output from the monostable circuit 115 and the monostable circuit 115
A monostable circuit 116 that generates a generation pulse 3 having a pulse width t3 by using the output signal of
And a NAND gate 11 for outputting a signal obtained by inverting a logical product signal of the signal a and the creation pulse 3 as a stop gate signal
7. The time constant circuits 118, 119, and 120 formed by the combination of the resistor and the capacitor (R1, C1), (R2, C2), and (R3, C3) form the pulse widths t1, t2 of the monostable circuits 113, 115, and 116. , T
I have decided 3.

The first measurement counter 78 is reset by the start gate signal output from the gate signal generation circuit 76, starts counting clocks (not shown), and outputs a signal output from the A / D conversion circuit 74. Stop counting. The second measurement counter 79 is reset by a start gate signal output from the gate signal generation circuit 76, starts counting clocks, and stops counting by a stop gate signal output from the gate signal generation circuit 76.

The MPU 80 includes a numerical register, a flag register, and the like.
Each of b has the following functions (1) and (2). (1) A first calculation function for calculating the light scanning angle θa of the object 27 based on the count values C1a and C2a of the first and second measurement counters 78 and 79 in the light scanning angle detection means 70a. (2) A second calculation function for calculating the light scanning angle θb of the object 27 based on the count values C1b and C2b of the first and second measurement counters 78 and 79 in the light scanning angle detection means 70b.

Next, the operation of FIGS. 12 to 14 will be described with reference to FIG.
This will be described with reference to FIG. The operation (A) and the operation (B) of detecting the optical scanning angles θa and θb will be described separately.
The target object 27 is determined based on the obtained optical scanning angles θa and θb.
The operation of calculating the coordinates (Px, Py) is the same as that of the above-described embodiment, and the description is omitted.

(A) Schematic operation (1) First and second light emitting / receiving sections 60 of optical scanning unit 59a
a, 61a from the first and second scanning lights 66, 67
Is output, the first scanning light 66 enters the main body 62 of the retroreflector 12B, and the reflected light is received by the light receiving element 64.
The second scanning light 67 is projected from the projection 63a of the retroreflector 12B.
s, 63be, 63ae, and the reflected light is received by the light receiving element 65. First and second optical scanning units 59b
The first, which is output from the light emitting element of the light emitting / receiving section 60b, 61b,
The second scanning lights 68 and 69 are the same as the first and second scanning lights 66 and 67 of the optical scanning unit 59a.
B enters the main body portions 62, 63bs to 63be, and the reflected light is received by the light receiving elements 64, 65.

(2) The light beams 21 are scanned by a predetermined angle θ (for example, about π / 2 radians (= 90 degrees)) by the rotation of the scan mirrors 25a and 25b by the pulse motors 26 and 26. When the target object 27 is present in the light scanning area, the light 21 is blocked by the target object 27, so that the light receiving elements 64, 65 of the first and second light receiving / emitting units 60a, 61a.
The light scanning angles θa and θb of the object 27 are obtained based on the received light signal of the target 27 and the received light signals of the light receiving elements 64 and 65 of the first and second light receiving / emitting units 60b and 61b.

(B) Detection of Light Scan Angles θa and θb For the sake of convenience, as shown in FIG. 15, the aspect ratio of the touch panel is 9:16, and the retroreflection with the scan mirror 25a around the scan mirror 25a. The angles formed by the lines connecting the protrusions 63as, 63be, 63ae of the body 12B are 60.6 ° and 29.4 °, and the line connecting the second light receiving / emitting unit 61a and the scan mirror 25a is the protrusion of the retroreflector 12B. Each component is assumed to be attached at an angle of 10 ° with respect to a line connecting the portion 63as and the scan mirror 25a.

(1) The received light energy of the light receiving elements 64 and 65 of the optical scanning unit 59a or 59b is received by the A / V conversion circuits 71 and 72 as a light receiving signal (voltage) 1 as shown in FIGS. , Is converted to 2.

(2) When the light receiving signal 1 shown in FIG.
By comparison with 2, the signal b including the signal corresponding to the position of the object 27 as shown in FIG.

(3) The light receiving signal 2 shown in FIG.
When input to the A / D conversion circuit 75, the A / D conversion circuit 7
By comparing the slice level SL1 with the slice level SL1, the scan mirror 2 as shown in FIG.
A signal a including a synchronization signal corresponding to the primary reflected light 5a and a signal corresponding to a start position and an end position of optical scanning is separated. In FIG. 16C, Ta, Tb, Tc, and Td are values corresponding to the component arrangement shown in FIG. 15, for example, 1.6 m.
s (milliseconds), 16 ms, 9 ms, and 21.3 ms.

(4) When the signal a is input to the gate signal generating circuit 76, the gate signal generating circuit 76 starts the start corresponding to the optical scanning start position as shown in FIGS. 16 (e) and 16 (h). A gate signal and a stop gate signal corresponding to the end position of the optical scanning are generated and output. That is, the falling of the signal a triggers the monostable circuit 113,
A pulse 1 having a pulse width t1 as shown in FIG. Since the creation pulse 1 is input to the OR gate 112 and also to the NAND gate 114, and the signal a is also input to the NAND gate 114, the NAND gate 114 receives the signal a from FIG.
A start gate signal as shown in FIG. In addition, the monostable circuit 11 is activated when the start gate signal rises.
5 is triggered, and the monostable circuit 115 in FIG.
A creation pulse 2 having a pulse width t2 as shown in (f) is created.
6 is triggered, and this monostable circuit 116 causes the same
A creation pulse 3 having a pulse width t3 as shown in FIG. This preparation pulse 3 is output together with the signal a to the NAND gate 1
17, the NAND gate 117 outputs a stop gate signal as shown in FIG.

(5) From the gate signal generation circuit 76 to FIG.
When the start gate signal shown in (e) is output, the first and second measurement counters 78 and 79 are generated by the start gate signal.
Is reset to start counting clocks. When the signal b shown in FIG. 16 (i) is output from the A / D conversion circuit 74, the first measurement counter 7 uses the signal included in the signal b.
8 stops counting clocks, and the count value becomes the number of clocks C1 corresponding to the period T1 from the start gate signal to the signal corresponding to the position of the object 27. When the gate signal generation circuit 76 outputs the stop gate signal shown in FIG. 16 (h), the second measurement counter 79 stops counting the clock by this stop gate signal, and the counted value is from the start gate signal to the stop gate signal. Period T
The clock number C2 corresponds to 2.

(6) The count value C of the first and second measurement counters 78 and 79 in one of the optical scanning angle detecting means 70a.
1 and C2 are set as C1a and C2a, and the first and second measurement counters 78 and 7 in the other light scanning angle detecting means 70b.
If the count values C1 and C2 of C.9 are C1b and C2b, M is calculated based on these count values C1a, C2a, C1b and C2b.
The light scanning angles θa and θb are obtained by the PU 80. That is, the MPU 80 firstly performs the light scanning angle detection means 70a,
70b, the count value C2a of the second measurement counter 79, 79,
Applying C2b to the above equations (3A) and (4A), Ka
(= (Angle of one scanning cycle) / C2a) and Kb (= (angle of one scanning cycle) / C2b) are obtained, and then the first measurement counters 78, 78 of the optical scanning angle detecting means 70a, 70b.
Are applied to the above equations (1A) and (2A) to obtain θa (= Ka × C1a) and θb (= Kb × C
1b) is obtained.

In the embodiment shown in FIG. 12, the second scanning light 67 (or 69) output from one of the second light emitting / receiving sections 61a (or 61b) is used for the corresponding projections 63as, 63a.
e (or 63bs, 63be) as well as the non-corresponding projection 63be (or 63ae), but the present invention is not limited to this, and the second scanning light 6
7 (or 69) correspond to the protruding portions 63as, 63ae
(Or 63bs, 63be) can also be used. That is,
The point of incidence of the second scanning light 67 (or 69) is further away from the scanning mirror 25a (or 25b) toward the distal end as the projection is farther from the scanning mirror 25a (or 25b).
b) corresponding projections 63as, 63ae (or 63)
bs, 63be) is not compatible with the projection 63be.
(Or 63ae), by adjusting the length of the protrusion 63ae (or 63be) and the angle of incidence of the second scanning light 67 (or 69) on the protrusion 63ae (or 63be). As a result, the second scanning light 67 (or 69) does not enter the non-corresponding protrusion 63be (or 63ae), and the corresponding protrusion 63as, 63ae (or 6).
3bs, 63be) can also be used. In this case, the detection accuracy of the optical scanning end position can be improved.

FIGS. 17 to 19 show a fourth embodiment of the present invention. The same parts as those in FIGS. 1, 12, and 13 are denoted by the same reference numerals, and description thereof is omitted. In FIG. 17, 1
2B is a retroreflector fixed inside a frame (not shown), 81a and 81b are optical scanning units, 82a and 8
2b is a scan mirror, and 83a and 83b are light emitting / receiving units. The optical scanning units 81a and 81b have scan mirrors 82a and 82b having a scan mirror 25 structure.
The optical scanning units 11a and 11b have the same configuration as that of the optical scanning units 11a and 11b, except for the differences from the structures of the optical scanning units 11a and 25b.

The scan mirror 82a has four reflection surfaces 8 formed around a rotation axis 84 as shown in FIG.
5, 85, 85 and 86 are provided. Three of the four reflecting surfaces 85, 85, 85, 86,
85, 85 are the rotation of the rotation shaft 84,
When the light 21 output from the light emitting element 19 of 3a is received,
The reflected light is incident on the main body 62 of the retroreflective body 12B as first scanning light 66A as shown by a dotted line, and the reflected light is received and returned to the light receiving element 20 of the light receiving / emitting section 83a. ing. The four reflecting surfaces 85, 85,
When the other one of the reflection surfaces 85 and 86 receives the light 21 output from the light emitting element 19 of the light emitting and receiving unit 83a by the rotation of the rotation shaft 84, the reflected light is reflected by the light receiving and emitting unit 83a. The light 21 output from the light emitting element 19 is reflected, and the projections 63as, 63be, 63ae of the retroreflective body 12B are reflected as a second scanning light 67A as shown by a solid line.
And the reflected light is received and returned to the light receiving element 20 of the light receiving / emitting section 83a.

The scan mirror 82b has the same configuration as the scan mirror 82a, and
When the light 21 output from the light emitting element 19 is received, the reflected light is converted into a first scanning light 68A shown by a dotted line and a second scanning light 69A shown by a solid line, and the first scanning light 68 is reflected by the retroreflector 12B. The light enters the main body 62, receives the reflected light, returns the light to the light receiving element 20 of the light emitting / receiving section 83b, and outputs the second scanning light 6
9A to the protruding portions 63bs, 63 of the retroreflector 12B.
ae, 63be, the reflected light is received, and the light is returned to the light receiving element 20 of the light emitting / receiving section 83b.

Reference numeral 90a denotes an optical scanning angle detecting means for detecting an optical scanning angle θa of the object 27 (not shown) in a corresponding optical scanning range based on a light receiving signal of the light receiving element 20 of the optical scanning unit 81a. . As shown in FIG. 19, the optical scanning angle detecting means 90a
1, a synchronization separation circuit 32 as an example of a first separation circuit, an amplification circuit 33, an A / D conversion circuit 34 as an example of a second separation circuit, first and second stop signal generation circuits 91 and 92,
First, second, third measurement counters 93, 94, 95, optical scanning period identification circuit 96, first and second enable control circuits 9
7, 98 and an MPU 99 as an example of an arithmetic means.

The optical scanning period discriminating circuit 96 performs optical scanning by any one of the first and second scanning lights 66A and 67A based on the light receiving signal of the light receiving element 20 of the optical scanning unit 81a. Specifically, an integration circuit 1 that integrates and outputs a light-receiving signal output from the A / V conversion circuit 31 and amplified by the amplification circuit 33.
01, a half-period delay circuit 102 for delaying the output signal of the integration circuit 101 by a half period of the optical scanning, a latch circuit 103 for latching the output signal of the half-period delay circuit 102 with a synchronizing signal, A three-period delay circuit 104 for delaying a signal by three periods of optical scanning, and an inverter 1 for inverting and outputting an output signal of the three-period delay circuit 104
05.

Reference numeral 90b denotes an optical scanning angle detecting means for detecting the optical scanning angle θb of the object 27 in the corresponding optical scanning range based on the light receiving signal of the light receiving element 20 of the optical scanning unit 81b. The detecting means 90b
A V conversion circuit 31, a synchronization separation circuit 32, an amplification circuit 33,
A / D conversion circuit 34, first and second stop signal generation circuits 91 and 92, first, second, and third measurement counters 93 and 9
The components up to 4, 95, the optical scanning period identification circuit 96, and the first and second enable control circuits 97 and 98 are configured in the same manner as the corresponding circuit of the optical scanning angle detecting means 90a.
Is shared with the MPU 99 of the optical scanning angle detecting means 90a.

The first and second stop signal generation circuits 9
1, 92 correspond to the start position based on the synchronization signal separated by the synchronization separation circuit 32 and the start position signal, the object position signal, and the end position signal separated by the A / D conversion circuit 34. A first stop signal and a second stop signal corresponding to the end position are generated.

The first and second measurement counters 93 and 94
Starts counting clocks using the synchronization signal separated by the synchronization separation circuit 32 as a reset signal, and generates the first and second signals generated by the first and second stop signal generation circuits 91 and 92.
The counting is stopped by the second stop signal. The third measurement counter 95 starts counting clocks using the synchronization signal separated by the synchronization separation circuit 32 as a reset signal, and outputs the object position signal separated by the A / D conversion circuit 34 to a third signal.
The counting is stopped as a stop signal.

When the output signal of the three-period delay circuit 104 of the optical scanning period discriminating circuit 96 is in the H level period, the first enable control circuit 97 performs the period during which the optical scanning by the first scanning light 68 is performed. As a result, the reset signal and the first and second stop signals supplied to the first and second measurement counters 93 and 94 are enabled, and the output signal of the inverter 105 of the optical scanning period discriminating circuit 96 is in the H level period (3
When the output signal of the period delay circuit 104 is a period corresponding to the L level period), the reset signal supplied to the third measurement counter 95 and the third stop Enable the signal.

The MPU 99 includes a number register, a flag register, and the like.
Each of b has the following functions (1) and (2). (1) A first calculation function for calculating the light scanning angle θa of the object 27 based on the count values of the first, second, and third measurement counters 93, 94, and 95 of the light scanning angle detection means 90a. (2) A second calculation function for calculating the light scanning angle θb of the object 27 based on the count values of the first, second, and third measurement counters 93, 94, and 95 of the light scanning angle detection means 90b.

Next, the operation of FIGS. 18 and 19 will be described with reference to FIG. Schematic operation (A), light scanning angle θ
A description will be given separately for the detection operation (B) of a and θb. The operation of calculating the coordinates (Px, Py) of the target object 27 based on the obtained optical scanning angles θa, θb is the same as that of the above-described embodiment, and thus the description is omitted.

(A) Schematic Function (1) The light 21 output from the light emitting element 19 of the light receiving / emitting section 83a of the optical scanning unit 81a is sequentially turned every period T in accordance with the rotation of the rotation shaft 84 of the scan mirror 82a. The light enters the four reflecting surfaces 85, 85, 85, 86. Light 21 incident on three of the four reflecting surfaces 85, 85, 85, 86 of the scan mirror 82a
Is incident on the main body 62 of the retroreflective body 12B as first scanning light 66A indicated by a dotted line in FIG. 17, and the reflected light is transmitted through the corresponding reflecting surfaces 85, 85, 85 to the light emitting / receiving section 83a.
The light scanning is performed by the first scanning light 66A after receiving the light by the light receiving element 20 of FIG. Four reflection surfaces 8 of scan mirror 82a
The remaining one of the reflection surfaces 86 among 5, 85, 85, 86
The light 21 incident on the second scanning light 6 indicated by a solid line in FIG.
7A, the protruding portions 63as, 6 of the retroreflector 12B.
3be and 63ae, the reflected light is received by the light receiving element 20 of the light emitting / receiving section 83a via the corresponding reflecting surface 86, and the optical scanning by the second scanning light 67A is performed.

(2) Light emitting / receiving section 8 of optical scanning unit 81b
The light 21 output from the light emitting element 19 of FIG.
Similarly, four reflection surfaces 85, 85, and 8 are sequentially set for each period T.
5 and 86, and the reflected light thereof is converted into the first and second scanning lights 68.
A, 69A, and the first scanning light 68A is the retroreflector 1
The reflecting surface 8 corresponding to the reflected light that enters the main body 62 of the 2B and corresponds to the reflected light
5, 85, 85, the second scanning light 69A is incident on the protruding portions 63bs, 63ae, 63be of the retroreflector 12B, and the light receiving element 20 receives the reflected light.

(3) Based on the rotation of the scan mirrors 82a, 82b by the pulse motors 26, 26, the first and second
Optical scanning is performed at a predetermined angle θ (for example, about π / 2 radians (= 90 degrees)) by the scanning lights 66A, 68A, 67A, and 69A. When the target object 27 is present in this light scanning region, the first scanning light 66A, 68A is blocked by the target object 27, and therefore, the light receiving element 20 by the first scanning light 66A, 68A,
20, the light scanning angle θ of the object 27 based on the light receiving signal
a and θb are determined. The object 2 is located within the optical scanning area.
Regardless of the presence or absence of 7, the light scanning period T2 corresponding to the start position to the end position of the light scanning is obtained based on the light receiving signals of the light receiving elements 20, 20 by the second scanning lights 67A, 69A.

(B) Detecting action of optical scanning angles θa and θb (1) The light receiving energy of the light receiving element 20 of the optical scanning unit 81a (or 81b) is calculated by the A / V conversion circuit 31 as shown in FIG.
It is converted into a light receiving signal as shown in FIG. The light receiving signal includes a signal corresponding to the start position and end position of the optical scanning of the second scanning light 67A (or 69A), and a signal corresponding to the target position of the optical scanning of the first scanning light 66A (or 68A). Signal and are included. The signal appearing between the second scanning light 69A and the second scanning light 69A (or 67A) is a protrusion 63be provided for the end position of the optical scanning by the other second scanning light 69A (or 67A).
(Or 63ae) by the reflected light.

(2) When the light receiving signal shown in FIG. 20A is input to the sync separation circuit 32, the sync signal is compared with the slice level SL1 by the sync separation circuit 32, and FIG.
Are separated.

(3) When the light receiving signal shown in FIG. 20A is amplified by the amplifier circuit 33 and input to the integrating circuit 101 of the optical scanning period discriminating circuit 96, the three-cycle delay circuit 104 of the optical scanning period discriminating circuit 96 From the output side, an optical scanning period identification signal as shown in (f) of the figure, which becomes H level during the optical scanning period of the first scanning light 66A and becomes L level during the optical scanning period of the second scanning light 67A, is output. Output. The details will be described below.

(3-1) When the light receiving signal shown in FIG. 20A is amplified by the amplifying circuit 33 and input to the integrating circuit 101, the output side of the integrating circuit 101 outputs a signal as shown in FIG. The integrated signal is output. (3-2) The signal shown in FIG.
02, a signal obtained by delaying the output signal of the integration circuit 101 by a half cycle (T / 2) of the optical scanning as shown in FIG. Output. (3-3) Since the latch circuit 103 latches the output signal of the half cycle delay circuit 102 with the synchronization signal output from the synchronization separation circuit 32, the signal as shown in FIG.
Output to the period delay circuit 104. Therefore, a signal obtained by delaying the output signal of the latch circuit 103 by three cycles (3T) as shown in FIG. 20F is output from the output side of the three-cycle delay circuit 104.

(4) The optical scanning period identification signal shown in FIG. 20 (f) is input to the first enable control circuit 97, and the signal obtained by inverting the optical scanning period identification signal by the inverter 105 is output to the second enable control circuit 98. When the optical scanning period identification signal is at H level, the input of the synchronization signal and the first and second stop signals to the first and second measurement counters 93 and 94 is enabled, and when the signal is at L level, the third measurement is performed. The input of the synchronization signal and the third stop signal to the counter 95 is enabled. Therefore, the first measurement counter 93 counts the number of clocks C0 corresponding to the period T0 from the synchronization signal to the signal corresponding to the optical scanning start position of the second scanning light, and the second measurement counter 94 calculates the number of clocks from the synchronization signal. The number of clocks C20 corresponding to the period T20 up to the signal corresponding to the optical scanning end position of the two scanning lights is counted. In addition, the third measurement counter 95 performs the period T10 from the synchronization signal to the signal corresponding to the position of the object to be scanned by the first scanning light.
Is counted.

(5) The count values C0, C2 of the first, second, and third measurement counters 93, 94, 95 obtained in (4).
The light scanning angle θa (or θb) of the object 27 is obtained by the first and second arithmetic functions (1) and (2) of the MPU 99 based on 0 and C10. That is, the first, second, and third measurement counters 9 in one of the optical scanning angle detecting means 81a.
The count values C0, C20 and C10 of 3, 94 and 95 are represented by C0
a, C20a, and C10a, and the first, second, and third measurement counters 9 in the other light scanning angle detection means 81b.
The count values C0, C20 and C10 of 3, 94 and 95 are represented by C0
b, C20b and C10b, first, C1a (= C
10a-C0a), C2a (= C20a-C0a), C
1b (= C10b-C0b), C2b (= C20b-C
0b) is calculated, and then the calculated values C1a and C2
The light scanning angles θa and θb are obtained based on a, C1b, and C2b.

In the embodiment shown in FIG. 17, one of the second scanning lights 67A (or 69A) has a corresponding projection 63a.
s, 63ae (or 63bs, 63be),
Although the projection 63be (or 63ae) is configured to be incident on the non-corresponding protrusion 63be, the present invention is not limited to this, and the second scanning light 67A (or 69A) may correspond to the corresponding protrusion 63a.
The present invention can also be applied to a case where light is incident only on s, 63ae (or 63bs, 63be). That is, the second scanning light 67 A (or 69
Since the incident point of A) moves away from the distal end side, the corresponding projection 63as from the scan mirror 82a (or 82b),
Utilizing that the distance to 63ae (or 63bs, 63be) is shorter than the distance to the non-corresponding protrusion 63be (or 63ae), the protrusion length of the protrusion 63ae (or 63be) and the second scanning light 67A (or 69A) are used. ) Projection 63
By adjusting the angle of incidence on ae (or 63be), the second scanning light 67A (or 69A) does not enter the unsupported protrusion 63be (or 63ae), and the corresponding protrusion 63as, 63ae (or). 63bs, 63be) can also be used. In this case, the detection accuracy of the optical scanning end position can be improved.

[0111]

According to the first aspect of the present invention, in the optical scanning type touch panel, the positions where the reflectivity of the retroreflector is different from the reflectivity of the retroreflector at the start position and the end position of the optical scanning by the scan mirror. The object for detection is fixed, and the light receiving object for detecting the start position and the end position is integrated with the retroreflector. Compared with the conventional example, the positional accuracy of the start position with respect to the retroreflector does not decrease, the start position can be clarified, and the end position can be further clarified. For this reason, even if a synchronization deviation occurs due to a rotation variation or a change over time of the motor that rotates the scan mirror, or a clock frequency fluctuates due to a variation or a change over time of the measurement oscillator, the clarified start position and end position are used. The detection error can be automatically corrected.

According to a second aspect of the present invention, in the first aspect, the position detecting object is attached to the start position and the end position of the retroreflector, and the reflectivity is calculated based on the reflectivity of the retroreflector. It is composed of a small anti-reflection tape, and the length of this anti-reflection tape in the optical scanning direction is less than the maximum length of the object in the optical scanning direction. Can be easily formed, and the start position and the end position of the optical scanning can be more clearly distinguished from the object position.

According to a third aspect of the present invention, in the second aspect of the present invention, the optical scanning angle detecting means includes a first and a second separation circuit, a gate signal generation circuit, a gate circuit, a first and a second measurement counter, and an arithmetic means. With this configuration, the configuration of the optical scanning angle detection unit can be simplified.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the gate circuit is composed of the first and second gate circuits, the filter and the third gate circuit, so that the configuration of the gate circuit can be simplified. .

According to a fifth aspect of the present invention, in the first aspect of the present invention, the position detecting object is fixed to the start position and the end position of the retroreflector, and the reflectance is larger than the reflectance of the retroreflector. The length of the mirror in the optical scanning direction is less than or equal to the maximum length of the object in the optical scanning direction. Can be easily formed, and the start position and the end position of the optical scanning can be clearly distinguished from the object position.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the optical scanning angle detecting means is composed of the first and second separation circuits and the arithmetic means, so that the configuration of the optical scanning angle detecting means can be simplified. Can be.

According to a seventh aspect of the present invention, in the sixth aspect of the invention, the arithmetic means is constituted by the first, second and third arithmetic means, so that the configuration of the arithmetic means can be simplified.

According to an eighth aspect of the present invention, in the optical scanning type touch panel, the retroreflector includes a main body and a projecting portion, and each optical scanning unit emits and receives the first and second scanning lights. , A second light receiving / emitting unit, wherein the first scanning light is incident on the main body of the retroreflector, the second scanning light is incident on the protruding portion of the retroreflector, and is scanned by the scanning mirror of the retroreflector. Since the starting position and the ending position of the optical scanning are configured so as to be a protrusion integrally projecting from the main body portion of the retroreflector, the start position detection light receiving portion and the retroreflector are separately attached to the substrate. Compared with the conventional example, the position accuracy of the start position with respect to the retroreflector does not decrease, the start position can be clarified, and the end position can be further clarified. For this reason, even if a synchronization deviation occurs due to a rotation variation or a change over time of the motor that rotates the scan mirror, or a clock frequency fluctuates due to a variation or a change over time of the measurement oscillator, the clarified start position and end position are used. The detection error can be automatically corrected.

According to a ninth aspect of the present invention, in the invention of the eighth aspect, the second scanning light of each optical scanning unit is incident only on the corresponding projection of the plurality of end position projections of the retroreflector. As described above, since the distance from the scan mirror to the corresponding protrusion is formed shorter than the distance from the scan mirror to the non-supporting protrusion, the end position detection accuracy can be further improved.

According to a tenth aspect of the present invention, in the eighth or ninth aspect, the optical scanning angle detecting means comprises a first and a second separating circuit, a gate signal generating circuit, a first and a second measuring counter, and a calculating means. Therefore, the configuration of the optical scanning angle detecting means can be simplified.

According to an eleventh aspect of the present invention, in the optical scanning type touch panel, the retroreflector has a main body and a projecting portion,
A scanning mirror of each optical scanning unit includes a plurality of reflecting surfaces that reflect light output from the light emitting unit and serve as first and second scanning lights having different optical axes, wherein the first scanning light is a main body of a retroreflector. The second scanning light is incident on the projection of the retroreflector, and the start position and the end position of optical scanning by the scanning mirror of the retroreflector are integrally projected from the main body of the retroreflection reflector. Since it is configured so as to be a protruding portion provided, compared with the conventional example in which the start position detection light receiving portion and the retroreflector are separately mounted on the substrate, the position accuracy of the start position with respect to the retroreflector does not decrease. , The start position can be clarified, and the end position can be further clarified. For this reason, even if a synchronization deviation occurs due to a rotation variation or a change over time of the motor that rotates the scan mirror, or a clock frequency fluctuates due to a variation or a change over time of the measurement oscillator, the clarified start position and end position are used. The detection error can be automatically corrected.

According to a twelfth aspect of the present invention, in the eleventh aspect, the second scanning light of each optical scanning unit is incident only on the corresponding one of the plurality of end position projections of the retroreflector. As described above, since the distance from the scan mirror to the corresponding protrusion is formed shorter than the distance from the scan mirror to the non-supporting protrusion, the end position detection accuracy can be further improved.

The invention of claim 13 is the invention of claim 11 or 12
In the invention, the optical scanning angle detecting means is composed of the first and second separation circuits, the stop signal generating circuit, the first, second, and third measurement counters, the optical scanning period discriminating circuit, the enable control circuit, and the arithmetic means. In addition, the configuration of the light scanning angle detecting means can be simplified.

According to a fourteenth aspect, in the thirteenth aspect, the optical scanning period discriminating circuit comprises an integrating circuit, a half-period delay circuit, a latch circuit, a three-period delay circuit, and an inverter, and the enable control circuit is a first control circuit. And the second enable control circuit, the configuration of the optical scanning period identification circuit and the enable control circuit can be simplified.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of an optical scanning type touch panel according to the present invention, and is a partially enlarged plan view of a main part.

FIG. 2 is a block diagram showing an example of a light scanning angle detecting means used in the embodiment of FIG. 1;

FIG. 3 is a block diagram showing a specific example of a filter 43 in FIG. 2;

FIG. 4 is a waveform chart of each part in FIG. 2;

FIG. 5 is a waveform chart of each part in FIG. 3;

FIG. 6 is a waveform diagram of a reception signal illustrating an operation when rotations of motors 26 in optical scanning units 11a and 11b in FIG. 1 change.

7 shows a case where a waveform of a signal corresponding to the position of the object 27 and a waveform of a signal corresponding to the end position of the other optical scanning overlap in one optical scanning of the optical scanning units 11a and 11b in FIG. FIG.

FIG. 8 shows a second embodiment of the optical scanning type touch panel according to the present invention, and is a partially enlarged plan view of a main part.

FIG. 9 is a block diagram showing an example of a light scanning angle detecting means used in the embodiment of FIG. 8;

FIG. 10 is a waveform chart of each part in FIG. 9;

FIG. 11 is a flowchart illustrating the operation of FIG. 9;

FIG. 12 is a perspective view showing a third embodiment of the optical scanning type touch panel according to the present invention, in which a part is enlarged.

FIG. 13 is a block diagram showing an example of a light scanning angle detecting means used in the embodiment of FIG.

14 is a block diagram of the gate signal generation circuit 76 in FIG.

FIG. 15 shows the scanning mirror 25a, the second light receiving / emitting unit 61a, and the protruding portions 63as and 63 of the retroreflector 12B of FIG.
It is explanatory drawing which shows arrangement | positioning on the touch panel of ae and 63be.

FIG. 16 is a waveform chart of each part in FIGS. 13 and 14;

FIG. 17 is a perspective view showing a main part of an optical scanning type touch panel according to a fourth embodiment of the present invention, which is partially enlarged.

FIG. 18 is an enlarged perspective view of a part of FIG.

FIG. 19 is a block diagram showing an example of an optical scanning angle detecting means used in the embodiment of FIG.

20 is a waveform chart of each part in FIG. 19;

FIG. 21 is a plan view showing a conventional optical scanning type touch panel.

FIG. 22 is a side view showing an attached state of the optical scanning units 11a and 11b in FIG.

23 is an explanatory diagram of a light receiving signal by a light receiving element of the optical scanning unit 11a (11b) of FIG.
FIG. 4 is a waveform diagram of a light receiving signal (1) based on reflected light of the first embodiment and a light receiving signal (2) based on reflected light of the start position detecting light receiving unit 13a (13b).

FIG. 24 is an explanatory diagram showing the principle of triangulation for coordinate detection.

[Explanation of symbols]

10 ... substrate (an example of a coordinate plane), 11a, 11b, 59
a, 59b, 81a, 81b ... optical scanning unit, 1
2, 12A, 12B: retroreflector, 14: frame retroreflector, 19: light emitting element (eg, laser diode), 20, 64, 65: light receiving element, 21: light output from light emitting element 19 (eg, laser) Light), 25, 2
5a, 25b, 82a, 82b ... scan mirror, 2
6 ... pulse motor (an example of motor) 27 ... object
28a, 28b, 51a, 51b, 70a, 70b,
90a, 90b: optical scanning angle detecting means, 30as, 3
0ae, 30bs, 30be: anti-reflection tape (an example of an object for position detection), 32: synchronization separation circuit (an example of a first separation circuit), 34, 75 ... A / D conversion circuit (an example of a second separation circuit), 35, 36, 76 ... gate signal generation circuit, 37 ... gate circuit, 38, 39, 78, 79,
93, 94, 95 ... measurement counter, 40, 58, 8
0, 99... MPU (an example of arithmetic means), 50as, 5
0ae, 50bs, 50be: mirror (another example of an object for position detection), 60a, 60b: first light emitting / receiving section, 61a, 6
1b: second light emitting / receiving section; 62: main body of retroreflector 12B; 63as, 63ae, 63bs, 63be: protrusion of retroreflector 12B; 66, 66A, 68, 6
8A: First scanning light, 67, 67A, 69, 69A: Second scanning light, 75: A / D conversion circuit (an example of a first separation circuit), 83a, 83b: Light emitting / receiving section, 91, 92: Stop signal Generation circuit, 96: optical scanning period identification circuit, 9
7, 98: enable control circuit, 101: integration circuit,
102: half cycle delay circuit, 103: latch circuit,
104: three-period delay circuit, 105, 111: inverter, 112: OR gate, 113, 115, 116
... monostable circuit (mono multivibrator), 114,
117: NAND gate, 118, 119, 120: Time constant circuit, L: Non-reflective tape 30as, 30ae, 3
0bs, 30be and mirrors 50as, 50ae, 50b
s, the length in the light scanning direction of 50be, Lm: object 27
, Θa, θb... Light scanning angles.

Front page of the continued F-term (reference) 2F065 AA03 BB05 CC16 DD00 DD19 EE00 FF09 FF24 FF65 GG04 GG13 HH04 HH14 JJ01 JJ05 LL00 LL13 LL16 LL62 MM26 QQ03 QQ11 QQ12 QQ23 QQ25 QQ33 QQ47 QQ51 QQ52 QQ53 2H045 AA01 5B068 BB20 BC02 BC05 BD17 BE08 CC12 DD11 5B087 AA02 AD01 CC26 CC33 DD17

Claims (14)

[Claims] At least two optical scanning units each having a scan mirror, a light emitting unit, and a light receiving unit face a coordinate plane, and each of the optical scanning units recursively reflects light output from the light emitting unit by reflection of the scan mirror. As it enters the reflector,
The light reflected by the retroreflector is received by the light receiving unit via the reflection of the scan mirror, and the light scanning angle of the object in the corresponding light scanning range based on the light receiving signal of the light receiving unit of each optical scanning unit. An optical scanning angle detecting means for detecting the position of the retroreflector in the optical scanning touch panel for obtaining a position on a coordinate plane designated by the object based on the detection angle of the optical scanning angle detecting means. An optical scanning type touch panel, comprising: a position detection object having a reflectance different from that of the retroreflector fixed to a start position and an end position of optical scanning by a mirror. 2. An object for position detection, comprising a non-reflective tape attached to a start position and an end position of a retroreflector and having a reflectivity smaller than that of the retroreflector. 2. The optical scanning type touch panel according to claim 1, wherein the length of the non-reflective tape in the optical scanning direction is less than or equal to the maximum length of the object in the optical scanning direction. 3. An optical scanning angle detecting means, comprising: a first separating circuit for separating a synchronizing signal corresponding to a primary reflected light of a scan mirror from a light receiving signal of a light receiving section; A second separation circuit that separates signals corresponding to a start position, an end position, and an object position of optical scanning; and a start position of optical scanning based on a synchronization signal separated by the first separation circuit.
A gate signal generation circuit that generates a start gate signal and a stop gate signal corresponding to the end position; a signal separated by the second separation circuit; and a start gate signal and a stop gate signal generated by the gate signal generation circuit. A gate signal for outputting a start signal corresponding to the start position of the optical scanning, first and second stop signals corresponding to the object position and the end position of the optical scanning, and a start signal output from the gate circuit. First and second measurement counters that are reset and start counting clocks, and stop counting with first and second stop signals output from the gate circuit, based on the count values of the first and second measurement counters. 3. An optical scanning type touch panel according to claim 2, further comprising: arithmetic means for calculating an optical scanning angle of the object by using the optical scanning type touch panel. 4. A gate circuit comprising: a first gate circuit for extracting a start signal from signals separated by a second separation circuit by a start gate signal generated by a gate signal generation circuit; and a gate circuit generated by the gate signal generation circuit. A second gate circuit for extracting a second stop signal from the signals separated by the second separation circuit by the stop gate signal, and a pulse having a pulse width less than a set value from the signal separated by the second separation circuit. A filter that removes and outputs a signal; and a third gate circuit that outputs, as a first stop signal, a logical sum signal of a second stop signal extracted by the second gate circuit and an output signal of the filter. The optical scanning type touch panel according to claim 3. 5. The position detecting object comprises a mirror fixed at the start position and the end position of the retroreflector and having a reflectivity greater than the reflectivity of the retroreflector. 2. The optical scanning touch panel according to claim 1, wherein a length in the scanning direction is formed to be equal to or less than a maximum length of the object in the optical scanning direction. 6. A light scanning angle detecting means for separating a synchronization signal corresponding to the primary reflected light of the scan mirror and a signal corresponding to the start position and the end position of the optical scanning from the light receiving signals of the light receiving section. A separation circuit, a second separation circuit that separates a signal corresponding to the target position of the optical scanning from the light receiving signals of the light receiving unit, a synchronization signal separated by the first and second separation circuits,
6. The optical scanning type touch panel according to claim 5, further comprising: computing means for computing an optical scanning angle of the object based on a start position signal, an end position signal, and an object position signal. 7. An arithmetic unit calculates an optical scanning period from an optical scanning start position to an object position based on the synchronization signal, the start position signal and the object position signal separated by the first and second separation circuits. A first calculating means for calculating an optical scanning period from a start position to an end position of optical scanning based on the synchronization signal, the start position signal and the end position signal separated by the first and second separation circuits. 7. An optical scanning touch panel according to claim 6, comprising: two arithmetic means; and third arithmetic means for calculating an optical scanning angle of the object based on the arithmetic values of said first and second arithmetic means. 8. At least two optical scanning units each having a scan mirror, a light-emitting unit, and a light-receiving unit face a coordinate plane, and each optical scanning unit reflects light output from the light-emitting unit by reflection of the scan mirror to be recurrent. As it enters the reflector,
The light reflected by the retroreflector is received by the light receiving unit via the reflection of the scan mirror, and the light scanning angle of the object in the corresponding light scanning range based on the light receiving signal of the light receiving unit of each optical scanning unit. A light scanning type touch panel for determining a position on a coordinate plane designated by an object based on the detection angle of the light scanning angle detection means, wherein the retroreflector is a main body. And a protruding portion integrally protruded from the main body for the start position and the end position of the optical scanning, wherein each of the optical scanning units has a different optical axis. First and second light receiving and emitting sections for emitting and receiving light, and the first scanning light is made incident on the main body of the retroreflective body by the scan mirror, and the second scanning light is emitted by the scan mirror. Incident on the projection of the retroreflector Optical scanning type touch panel characterized by comprising. 9. A method according to claim 1, wherein the second scanning light from each of the optical scanning units is provided from the scan mirror to the corresponding projection so that only the corresponding projection among the plurality of end position projections of the retroreflector is incident. 9. The optical scanning touch panel according to claim 8, wherein the distance is formed shorter than the distance from the scan mirror to the unsupported protrusion. 10. An optical scanning angle detecting means, comprising: a first separating circuit for separating a signal corresponding to an object position of optical scanning from light receiving signals of the first light receiving / emitting unit; and a light receiving signal of the second light receiving / emitting unit. A second separation circuit for separating a synchronization signal corresponding to the primary reflected light of the scan mirror from the signals corresponding to the start position and the end position of the optical scanning, and a synchronization signal separated by the second separation circuit A gate signal generation circuit that generates a start gate signal and a stop gate signal corresponding to the start position and the end position of the optical scanning based on the start position signal and the end position signal, and a start gate signal generated by the gate signal generation circuit A counter as a reset signal, counts clocks, and stops counting using the object position signal separated by the first separation circuit as a stop signal; The clock counts a start gate signal as a reset signal, and a second measuring counter to stop counting the stop gate signal generated by the gate signal generating circuit as a stop signal, the first, second
The optical scanning touch panel according to claim 8, further comprising: an arithmetic unit configured to calculate an optical scanning angle of the object based on a count value of the measurement counter. 11. A scanning mirror, at least two optical scanning units each having a light emitting unit and a light receiving unit are made to face a coordinate plane, and each optical scanning unit recursively reflects light output from the light emitting unit by reflection of the scan mirror. As it enters the reflector,
The light reflected by the retroreflector is received by the light receiving unit via the reflection of the scan mirror, and the light scanning angle of the object in the corresponding light scanning range based on the light receiving signal of the light receiving unit of each optical scanning unit. A light scanning type touch panel for determining a position on a coordinate plane designated by an object based on the detection angle of the light scanning angle detection means, wherein the retroreflector is a main body. And a projecting portion integrally protruded from the main body for the start position and the end position of optical scanning, and the scan mirror of each optical scanning unit emits light output from a light emitting unit. A plurality of reflecting surfaces for reflecting first and second scanning lights having different optical axes, the first scanning light being incident on a main body of the retroreflector, and the second scanning light being reflected by the retroreflector; Incident on the protruding part of the reflective body Optical scanning type touch panel according to claim. 12. The distance from the scan mirror to the corresponding protrusion such that the scanning light of each optical scanning unit is incident only on the corresponding protrusion among the plurality of end position protrusions of the retroreflector. 12. The optical scanning type touch panel according to claim 11, wherein the optical scanning type touch panel is formed to be shorter than a distance from the scan mirror to the non-corresponding protrusion. 13. An optical scanning angle detecting means, comprising: a first separating circuit for separating a synchronization signal corresponding to a primary reflected light of a scan mirror from a light receiving signal of a light receiving section; A second separation circuit for separating signals corresponding to a start position, an object position, and an end position of optical scanning; a synchronization signal, a start position signal, an object position signal, and an end signal separated by the first and second separation circuits; A stop signal generation circuit for generating first and second stop signals corresponding to a start position and an end position of optical scanning based on the position signal, and counting of a clock using the synchronization signal separated by the first separation circuit as a reset signal And the first signal generated by the stop signal generation circuit.
First and second measurement counters that stop counting with a second stop signal, and counting of clocks is started using the synchronization signal separated by the first separation circuit as a reset signal, and a target separated by the second separation circuit. A third measurement counter that stops counting using the object position signal as a third stop signal, and identifies which of the first and second scanning lights is performing optical scanning based on the light receiving signal of the light receiving unit. The first, second, and third measurement counters are inserted before the first, second, and third measurement counters, and when the light scanning period identification circuit identifies the light scanning period of the first scanning light, The reset signal and the first and second stop signals supplied to the second measurement counter are enabled, and when the light scanning period identification circuit identifies the optical scanning period of the second scanning light, the reset signal is supplied to the third measurement counter. Be done Tsu DOO signal, an enable control circuit the third stop signal to enable the first, second,
13. The optical scanning touch panel according to claim 11, further comprising: an arithmetic unit configured to calculate an optical scanning angle of the object based on a count value of the third measurement counter. 14. An optical scanning period identification circuit, comprising: an integrating circuit for integrating and outputting a light receiving signal of a light receiving section; a half cycle delay circuit for delaying an output signal of the integrating circuit by a half cycle of optical scanning;
A latch circuit for latching the output signal of the half-period delay circuit with the synchronization signal separated by the first separation circuit; and delaying the signal latched by the latch circuit by three periods of optical scanning.
A period delay circuit; and an inverter for inverting and outputting an output signal of the three-period delay circuit, wherein the enable control circuit supplies the first and second measurement counters with the output signal of the three-period delay circuit. A first enable control circuit for enabling a reset signal, first and second stop signals, a second enable control circuit for enabling a reset signal to a third measurement counter and a third stop signal by an output signal of the inverter; 14. The optical scanning type touch panel according to claim 13, comprising: