JP2529590B2 - Infrared receiver for vehicle - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light receiving device, and more particularly to a device for receiving infrared rays that operates a controlled part of a vehicle.

Prior Art For example, as shown in JP-A-62-173354,
2. Description of the Related Art An anti-theft device including a key that generates an optical signal including a predetermined code signal and a specific code determining unit that generates a coincidence signal when an optical signal emitted from the key is received is known. This anti-theft device has a picking signal output means, and when unlocked without generating a coincidence signal of the specific code discriminating means, judges that the lock is unauthorized and activates the alarm device. However, when the optical signal emitted from the key is received and unlocked in the state where the coincidence signal is generated from the specific code discriminating means, the alarm device is not activated.

Further, in Japanese Patent Laid-Open No. 62-174476, a key for generating an optical signal containing a predetermined code signal and a specific code for generating a coincidence signal when receiving an optical signal emitted from the key provided in a lock device are disclosed. A house having a discriminating means and a controlled part operated by a coincidence signal of the specific code discriminating means,
An electronic control device for an automobile or the like is disclosed. In this electronic control device, a battery, a switch, a power supply switching circuit connected to the battery and the switch, a specific code generator activated by an output of the power supply switch, and a specific code generated by an output of the specific code generator. And a light-emitting element that generates an optical signal. The optical signal emitted from the light emitting element is received by the light receiving element connected to the specific code discriminating means. The specific code determining means sends an output to the controlled unit when the signal received by the light receiving element and the preset code signal match.

Further, as disclosed in Japanese Patent Publication No. 56-11032, there is known a lock device including a lock mechanism that operates a lock portion by electric means and a key mechanism that includes a transmitter.
Each of the lock mechanism and the key mechanism is provided with a pulse pattern generator that generates a specific pulse train in synchronization with a clock signal generated a predetermined number over time from an oscillator of the key mechanism. The lock mechanism and the key mechanism are connected to each other by an optical transmission means, and when both pulse trains are temporally coincident,
The locking part of the lock mechanism is unlocked.

As disclosed in Japanese Examined Patent Publication No. 63-11509, there is known a vehicle lock control device having a transmission section independent of the vehicle and a reception section mounted on the vehicle. The transmission unit includes a DC power supply, an oscillator that oscillates a message, and a transmission device that remotely transmits the message in series. The receiving unit includes a power supply device, a receiving device that receives a message, and
It has a memory for storing only one encoded message and a comparator for comparing the received message with the message stored in the memory and generating one signal if they match. The transmitting device of the transmitting unit has a diode that emits infrared light, and the receiving device of the receiving unit has a light receiving diode.

SUMMARY OF THE INVENTION By the way, since a conventional infrared light receiving sensor mounted on a vehicle is mounted inside a vehicle, when the infrared light is emitted from the infrared light emitting device, the light receiving device has the vehicle body panel of the vehicle or a seat backrest of a seat. In some cases, it was difficult to accurately irradiate the light receiving portion of the light receiving device. In addition, the interior of a car may be exposed to strong direct sunlight, and the room temperature may reach a high temperature of over 50 ° C during the day.
Therefore, there is a drawback that the light receiving element is destroyed by the high temperature. Further, when an indicator is provided on the light receiving device and the light receiving device receives infrared rays containing a predetermined code, even if the indicator is turned on, it may be invisible because of a shadow of the vehicle body panel or the back of the seat. When the infrared light receiving sensor is installed in the vehicle, wiring has to be performed so as not to be exposed in the room, which is a problem in design and manufacturing.

In this respect, there is a method of providing an infrared light receiving sensor in the room lamp as shown in, for example, Japanese Utility Model Laid-Open No. 61-187869, but in this structure, the position and the angle at which the infrared light is emitted from the infrared light emitting device is limited. Therefore, the operator had to operate the infrared light emitting device in a special posture. Further, if the vehicle is left unattended in the middle of summer, the temperature inside the room reaches 50 ° C or higher, so that the problem that the light receiving element is destroyed or saturated cannot be solved. Further, since the light receiving element is arranged, the case of the room lamp has to be upsized.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned drawbacks and to provide an infrared light receiving device that can easily operate the infrared light emitting device and does not cause a problem of high temperature destruction of the light receiving element.

Means for Solving the Problems An infrared light receiving device for a vehicle according to the present invention includes a housing attached to a vehicle body and forming a lamp chamber, and a valve mounted in the lamp chamber, adjacent to and at least 10
It has an infrared light receiving sensor fixed to the housing in the lamp chamber at a distance of mm, and a Fresnel lens attached to the front part of the lamp chamber. Further, the infrared light receiving sensor has an indicator for generating visible light, and when the infrared light including a predetermined code is detected, the indicator is lit for a certain period of time.
In the present specification, the “light room” means the inside of a housing provided with a combination lamp constituting a tail lamp or a main lamp, which is normally exposed and attached to the outside of the vehicle body, but is not limited to these and is not limited to , The interior of various other vehicle lamps such as direction indicators.

Function The Fresnel lens has the function of reflecting the direct sunlight from above, which is emitted to the infrared light receiving sensor, to the outside of the lamp chamber. Therefore, the Fresnel lens almost prevents the direct sunlight from entering the lamp chamber. In addition, the light chamber is in direct contact with the outside of the vehicle to maintain good ventilation. Therefore, it is possible to prevent the temperature rise in the lamp chamber due to the direct sunlight and the destruction or saturation of the infrared light receiving sensor due to the infrared rays contained in the direct sunlight.

Further, the Fresnel lens has an effect of allowing only light rays substantially parallel to the road surface or light rays within a certain angle range to enter the lamp chamber. For this reason, when the infrared ray is irradiated toward the infrared ray receiving sensor from a height around the position of the body of the person within the range of the infrared ray located far away from the vehicle, the infrared ray receiving sensor can sufficiently receive the infrared ray.

In this case, when the infrared light emitted from the infrared light emitting device outside the vehicle passes through the Fresnel lens, the infrared light is deflected toward the infrared light receiving sensor by the prism action, the refraction action, or the reflection action of the Fresnel lens. Therefore, due to the converging action of the Fresnel lens, the infrared light radiated on the front surface of the Fresnel lens in a large area is converged toward the focus of the small area on the infrared light receiving sensor. Therefore, a sufficient amount of infrared rays can be supplied to the infrared light receiving sensor.
When the indicator lights up, the light projected through the Fresnel lens in an enlarged area is emitted in an area that does not diffuse much outside the vehicle. Therefore, the operator can confirm the operation of the infrared light receiving device by sufficiently observing the lighting of the indicator at a position far from the automobile.

Embodiments Embodiments of the present invention will be described below with reference to FIGS.

First, as shown in FIGS. 1 and 2, a vehicle infrared light receiving device 1 is attached to a vehicle body and a housing 2 that forms a lamp chamber 3, and is attached to a support wall 7 of the housing 2 in the lamp chamber 3. The infrared light receiving sensor 5 fixed to the housing 2 in the lamp chamber 3 that is adjacent to the bulb 8 and is separated from the bulb 8 by at least 10 mm, and made of synthetic resin or glass attached to the front portion of the lamp chamber 3. And a Fresnel lens 4. The Fresnel lens 4 has an inner lens 4a mounted inside the lamp chamber 3 and an outer lens 4b exposed outside the inner lens 4a and outside the vehicle body. The bulb 8 becomes hot during lighting, and if the infrared ray receiving sensor 5 is placed very close to the bulb 8, the infrared ray receiving sensor 5 is destroyed or malfunctions due to the heat of the bulb 8. As a result of the experiment, it was found that under any circumstances, if the infrared light receiving sensor 5 is installed in the lamp chamber 3 with a distance of 10 mm or more from the bulb 8, the infrared light receiving sensor 5 is not affected by the valve 8.

As shown in FIGS. 3 to 5, the infrared light receiving sensor 5 has a light receiving element 10 for receiving infrared rays, and an indicator 11 such as a red or other color light emitting diode or lamp for generating visible light. When the light receiving element 10 detects an infrared ray containing a predetermined code, the indicator 11 is lit for a certain period of time. The light receiving element 10 and the indicator 11 are mounted on the substrate 13 arranged in the case 12. A light-transmissive resin cover 14 is attached to the front surface of the case 12. But,
An opening 15 is provided in the case 12 so as to face the indicator 11. A bracket 16 is detachably snap-fitted to the case 12, but a detailed structure is not shown. Further, the bracket 16 is attached in an opposite manner to that shown in FIGS. 1 and 2 and FIGS. 4 and 5. The bracket 16 includes a connecting portion 16a mounted in a fitting groove (not shown) of the case 12, and a fixing portion 16b bent from the connecting portion 16a at a substantially right angle and having a hole 17.
And a stopper portion 16c bent at a right angle from the fixed portion 16b.
And The stopper portion 16c is the support wall 7 of the housing 2.
It is inserted into the hole 7a formed in the.

As shown in FIGS. 3 and 6, the outer lens 4b of the Fresnel lens 4 is a fisheye lens. The inner lens 4a is composed of an infrared light receiving sensor 5, a refraction system prism 20 formed in a central portion opposed to the bulb 8, and a reflection system prism 21 arranged around the refraction system prism 20. Specifically, the refraction system prism 20 is a refraction prism, and the reflection system prism is a total reflection prism. Refractive prism 20
The surface 22 on the center side has a shape substantially perpendicular to the front surface, and the surface 23 on the opposite side has an inclined shape, and is formed at the same pitch. The reflecting prism 21 has an isosceles triangular shape in which the surface 24 on the center side and the surface 25 on the opposite side are inclined at substantially equal angles, and are formed at substantially the same pitch.

In the above lens structure, the light radially emitted from the bulb 8 is deflected by the inner lens 4a by the prism action, the refraction action, or the reflection action as shown by the solid line 26, passes through the outer lens 4b, and becomes almost parallel rays of the Fresnel lens 4. It is irradiated outside the vehicle. The light emitted from the bulb 8 outside the vehicle reaches a sufficient distance according to the safety standard of the road transportation vehicle. Similarly, infrared rays emitted from an infrared light emitting device (not shown) in a far range are indicated by a dotted line 27.
The light passes through the outer lens 4b and is irradiated at right angles to the front surface of the inner lens 4a. That is, the infrared ray is transmitted through the optical path completely opposite to the light emitted from the bulb 8, and the infrared ray is received by the infrared ray receiving sensor 5 by the prism action, refraction action or reflection action of the Fresnel lens 4.
Is deflected towards and received.

Further, the Fresnel lens 4 has a function of reflecting the direct sunlight from above, which is emitted to the infrared light receiving sensor 5, to the outside of the lamp chamber. Therefore, the Fresnel lens 4 almost prevents the direct sunlight from entering the lamp chamber 3. Moreover, since the light chamber 3 is directly connected to the outside of the vehicle to maintain good air permeability, the temperature in the light chamber 3 does not rise even when exposed to sunlight. Therefore,
It is possible to prevent the temperature rise in the lamp chamber 3 due to the direct sunlight and the destruction or saturation of the infrared light receiving sensor 5 due to the infrared rays contained in the direct sunlight.

Further, the Fresnel lens 4 has an effect of allowing only light rays substantially parallel to the road surface or light rays from a certain angle range to enter the lamp chamber 3. For this reason, when the infrared ray is irradiated toward the infrared ray receiving sensor 5 from a height around the human body position within the infrared ray range far away from the vehicle, the infrared ray receiving sensor 5 can sufficiently receive the infrared ray.

In this case, when the infrared rays emitted from the infrared light emitting device outside the vehicle pass through the Fresnel lens 4, the infrared rays are deflected toward the infrared light receiving sensor 4 by the prism action, the refraction action, or the reflection action of the Fresnel lens 4. Therefore, due to the converging action of the Fresnel lens 4, the infrared light radiated on the front surface of the Fresnel lens 4 in a large area is converged toward the infrared light receiving sensor 5 toward the focus of a small area. Therefore, a sufficient amount of infrared rays can be supplied to the infrared light receiving sensor 5.

FIG. 7 shows a circuit diagram of the receiving device 30. The receiving device 30
It has a sensor circuit 40, a control circuit 41 that receives a signal from the sensor circuit 40, and a lock control circuit 42 that is operated by the output of the control circuit 41. The sensor circuit 40 has a one-chip infrared light receiving circuit 50 including the infrared light receiving sensor 5, and an amplifier circuit 51 that amplifies the signal received by the infrared light receiving circuit 50 and supplies it to the control circuit 41. The amplifier circuit 51 has two transistors 52 and 53. The positive side line 54 of the sensor circuit 40 is connected to the output port O ₁ of the control circuit 41, and the negative side line 55 of the sensor circuit 40 is grounded. Positive line 54 and negative line 55
Are connected in parallel with smoothing capacitors 56 and 57. The positive side line 54 is connected to the output port O ₂ of the control circuit 41 via the display red light emitting diode 58 and the resistor 59 which form the indicator 11.

The emitter of the transistor 52 is connected to the positive line 54, the base is connected to the light receiving circuit 50, and the collector is connected to the base of the transistor 53. The emitter and the collector of the transistor 53 are connected to the input port I ₁ of the control circuit 41 through the diode 60 and the base of the transistor 62 through the diode 61. The emitter of the transistor 62 is connected to the power supply, and the collector is connected to the input port I ₇ of the control circuit 41 via the reset circuit 63. The reset circuit 63 includes a resistor 64 connected between the collector of the transistor 62 and the ground, a capacitor 65 connected between the collector of the transistor 62 and the input port I _7, and a connection between the input port I ₇ and the ground. Has a resistor 66 and a diode 67 connected in parallel.

The control circuit 41 is a CPU composed of a one-chip microcomputer. R is applied to the input ports I _{2 to} I ₄ of the control circuit 41.
OM68 is connected. A fixed number is stored in the ROM 68. Transistors 70 and 71 as driver circuits are connected to the output ports O ₃ and O ₄ of the control circuit 41 via resistors 72 and 73, respectively. The collector of the transistor 70 is a relay
It is connected to the power supply via the coil 75 of 74, and the emitter is grounded. Similarly, the collector of transistor 71 is relay 76.
Is connected to the power supply through the coil 77 and the emitter is grounded. Of the three contacts of the relays 74 and 76, the contacts 74a and 76a are connected to the power supply. The contacts 74b and 76b are grounded. Contact 74
c and 76c are connected to both terminals of the motor 80 which drives the locking device. A back electromotive force prevention controller 81 is connected to the motor 80. Further, the input ports I ₅ and I ₆ of the control circuit 41 are connected to a state detection device 82 which detects a locked state and an unlocked state of the lock device. The state detecting device 82 has a switch (not shown), and this switch is switched at the time of a lock operation and an unlock operation of the lock device.

In the above configuration, the infrared light emitted from the infrared light emitting device is received by the infrared light receiving sensor 5 of the infrared light receiving circuit 50. The signal generated by the infrared light receiving circuit 50 is supplied to the input port I ₁ of the control circuit 41 via the amplifier circuit 51. At the same time, when the amplifier circuit 51 turns on, the transistor 62 turns on. Therefore, the trigger signal is applied to the input port I ₇ of the control circuit 41 via the reset circuit 63, and the control circuit 41 is activated. Therefore, the storage means of the control circuit 41 stores the light reception signal supplied to the input port I ₁ . Simultaneously with or after this, the control circuit 41 reads the fixed number stored in the ROM 68 into storage means such as RAM (Random Access Memory).

Here, the comparison means in the control circuit 41 compares the fixed number included in the signal of the infrared light emitting device supplied through the infrared light receiving sensor 5 of the light receiving circuit 50 with the fixed number stored in the ROM 68. If the received fixed number and the read fixed number do not match, the lock is not unlocked. On the contrary, when these fixed numbers match, the preceding code number stored last time is compared with the currently input code number to judge whether the inputted code number is larger or smaller than the preceding code number. It In this embodiment, it is selectively determined whether the code number is larger or smaller than the preceding code number, and if a correct code number is input, a fixed numerical value is progressively added. In this case, it is determined whether or not the currently input code number is larger than the preceding code number.

The comparing means of the control circuit 41 judges whether the input code number is larger or smaller than the preceding code number, and when it is larger than the preceding code number, the control circuit 41 outputs the output port O ₃
An unlock signal from the
Seconds). Therefore, the transistor 70 is turned on, the coil 75 of the relay 74 is energized, the contacts 74a and 74c are connected, and the motor 80 rotates in one direction. Therefore, the locking device (not shown) unlocks. At this time, the indicator
The output port O ₂ to which the cathode of the red light emitting diode 58 as 11 is connected becomes a low level voltage. For this reason, since the light emitting diode 58 is turned on, the light of the light emitting diode 58 projected through the Fresnel lens 4 in an enlarged area is emitted in an area that does not diffuse much outside the vehicle. Therefore, the operator should be able to see the indicator 11 at a position far from the vehicle.
The operation of the lock device can be confirmed by visually observing the lighting of.

The comparing means of the control circuit 41 judges whether the input code number is larger or smaller than the preceding code number. When the comparing code number is smaller than the preceding code number, the control circuit 41 stores the current code number in the storing means, and the previous n. All the preceding code numbers of the batch (for example, three batches) are compared with each other, and the comparison is made for the larger or smaller one. In this embodiment, since the case where it is larger than the preceding code number is set, when it is larger than the preceding code number, the unlock signal is sent from the output port O ₃ . If it is smaller than the preceding code number, control circuit 41
Produces no output.

The control device 41 receives a signal from the state detection device 82, and when the infrared signal emitted from the transmission device 1 is in the locked state, sends a lock signal from the output port O ₄ for a fixed time (for example, 0.5 seconds), Switch on transistor 71. Therefore, the relay 76 is energized and the coil 77 is energized, so that the contacts 76a and 76c are connected. Therefore, a current flows in the motor 80 in the opposite direction, and the locking device is locked. In the above embodiment, the case where the code number is progressively increased has been described, but when the code number reaches the maximum value within a predetermined numerical range, it is returned to the first small value.

EFFECTS OF THE INVENTION In the infrared ray receiving device for a vehicle of the present invention, the life of the infrared ray receiving sensor is prevented by preventing the high temperature destruction due to the temperature rise in the lamp chamber due to the direct sunlight and the destruction or the saturation of the infrared ray receiving sensor by the infrared rays contained in the direct sunlight. Can be extended. Also, instead of in an unreasonable posture, when infrared rays are radiated from the height around the torso position of a person toward the light room facing the outside of the vehicle,
Since the infrared light receiving sensor can sufficiently receive infrared light, the operation of the infrared light emitting device becomes easy. Further, a sufficient amount of infrared rays can be supplied to the infrared light receiving sensor by the Fresnel lens, and the infrared light receiving device can be operated reliably. In other words, in the vehicle infrared light receiving device of the present invention, it is possible for the infrared light receiving sensor to detect infrared light transmitted from a distance farther than the transmission distance to the conventional infrared light receiving device.

[Brief description of drawings]

1 is a front view of an infrared ray receiving device for a vehicle according to the present invention, FIG. 2 is a sectional view taken along line II-II in FIG. 1, and FIG. 3 is a sectional view taken along line III-III in FIG. FIG. 4 is a front view of an infrared ray receiving sensor, FIG. 5 is a side view of FIG. 4, FIG. 6 is a sectional view of an inner lens, and FIG. 7 is an electric circuit used in a vehicle infrared ray receiving device according to the present invention. It is a figure. 1 ... Infrared light receiving device for vehicle, 2 ... Housing, 3 ...
… Light room, 4 …… Fresnel lens, 5 …… Infrared sensor, 8 …… Bulb, 11 …… Indicator,

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location H03K 17/78 H03K 17/78 U H04B 10/10 H04B 9/00 R 10/105 10/22

Claims (1)

(57) [Claims] 1. A housing attached to a vehicle body and forming a lamp chamber, an infrared light receiving sensor fixed to the housing in the lamp chamber adjacent to a bulb mounted in the lamp chamber and at least 10 mm away from the bulb, It has a Fresnel lens attached to the front of the chamber, the infrared light receiving sensor has an indicator for generating visible light, and when infrared light including a predetermined code is detected, the indicator is lit for a certain period of time. Infrared light receiving device for vehicles.