JPS595502A - Automatic tracing device for spot light - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic spotlight tracking device that automatically tracks a spotlight spot on a moving target.

Conventionally, as shown in FIG. 1, a target (
The direction of 21 is detected by the transmitting direction detector (3), and the direction of the spotlight (6) is automatically controlled by the output of the control unit (6) which operates based on the detection output. An automatic tracking device for a spotlight that is always directed toward the target (2) has been proposed. However, in such a conventional example, since the transmitter (1) continuously performs the transmitting operation, the power consumption of the battery built in the transmitter (1) is large, and the problem is that it is not suitable for long-term use. was there. Therefore, when there is no need for the spotlight (5) to track its own OJ, it is possible to consider a method of artificially turning off the switch of the transmitter fil. The problem was that it was extremely troublesome to operate.

The present invention has been made to solve these problems of the conventional example, and automatically turns off the transmitter when automatic tracking of the spotlight is not required, thereby saving battery power. It is an object of the present invention to provide an automatic spotlight tracking device that can reduce the number of spotlights.

The configuration of the present invention will be described below with reference to illustrated embodiments. Second
7 to 7 show an embodiment of the present invention, and as shown in FIG. 2, the spotlight 1-(6) is linked with the transmitting direction detector (3) and The transmission direction detector (3) is rotated by the target (2).
) is receiving a transmission signal from a transmitter ill owned by The transmitter f1+ is designed to emit modulated light modulated at several KHz, and is designed to stop its transmitting operation when it receives the irradiated light from the spotlight (5). As shown in Fig. 3, the transmitting direction detector (3) has a condensing beam (A) consisting of a convex lens +7+ +8) and a concave lens (9), and the beam direction detector (3) has a light focusing beam (A) consisting of a convex lens +7+ +8) and a concave lens (9). A pair of optical sensors +j (Xi) (I2) are arranged in parallel in a direction substantially parallel to the moving direction of a transmitter (1) serving as a light source. Convex lens (7) (8) of condensing beam (3)
) is completely fixed, and the concave lens (9) can be moved back and forth in the direction shown by arrow PK. A pair of optical sensors (Xl) (I2) collects light and focuses the beam (A) at the focal position CF)
is located slightly forward of the optical sensor (
A slightly blurred image is obtained on the surface of Xi) (I2). As the light cell υt (Xi) (I2), a solar cell, a photodiode, etc. can be used. The focal position ti (F) of the condenser lens (3) can be freely shifted by moving the concave lens (9) back and forth, thereby widening or narrowing the field of view of the transmitting direction detector (3). Become able to do things1
There is. Figure 4 shows the operating principle of the transmitting direction detector (3) of the present invention, and as shown by the solid line in the figure, ・1
When an image is formed approximately in the middle of the pair of light secessors (Xi) and (I2), the difference in output between the light secessors (Xl) and (I2) becomes almost zero. In addition, as shown by the dotted line in the same figure, if the direction of arrival of light from the transmitter (i.e. the light source) and the optical axis direction (C) of the transmitting direction detector (3) are misaligned, one optical center t ( Since the amount of light hitting I2) is larger than the amount of light hitting the other photosensor (Xi), the output of photosensor +j (I2) is larger than the output of photosensor (Xl).On the contrary, If the direction of arrival of the light is deviated from the direction shown by the dotted line in Fig. 4 with respect to the optical axis direction (C), the output of the optical sensor (Xi) is higher than that of the optical sensor ( Therefore, if the angular deviation between the light arrival direction and the optical axis direction (C) of the emission direction detector (3) is θ, the optical sensor (Xl
) and (I2) changes as shown in FIG. Therefore, this light sets (XI) and (I
The control unit (6) controls t so that the difference between the outputs of 2) becomes zero.
By automatically controlling the controller (4), it is possible to always direct the spotlight (6) in the direction of the transmitter ill. Figure 6 shows the configuration of the control section (6), in which the outputs of the optical sensors Amplified, tuned amplifier (101
Each output of (I+) is averaged by a rectifying and smoothing circuit or the like and input to a differential amplifier (12), so that the difference component can be amplified 6. The output of the differential amplifier (12) is power amplified in the Tanabata drive unit 03) and supplied to the Tanabata driver (4).

The output (4) is designed to rotate forward or backward depending on the polarity of the input voltage, such as DC -9, so that the difference between the outputs of the optical sensor (Xl) and (I2) becomes zero. If so, the rotation of Tanabata (4) would stop.

As shown in FIG.
4) and a light receiving section 05), and when the light receiving section (16) does not receive light from the spotlight (5), the oscillation circuit (16) operates and emits a signal of several KHz. It is designed to be supplied to the section (14). On the other hand, the light of the spotlight (5) is the target (2)
When it hits the light receiving section (15), the oscillation operation of the oscillation circuit (16) is stopped after a certain period of time delay due to the zero output of the delay circuit.
From 4) onwards, modulated light is no longer emitted.

In the control section (6), when the transmission signal from the transmitter (1) cannot be obtained, the automatic tracking operation of the spotlight (5) is naturally impossible, so the transmitter +1
When no transmission signal is obtained from +, the power for automatic tracking in the control unit (6) may be turned off. Next, when the target (2) moves and the light from the spotlight (5) no longer hits the light receiving section (15), the oscillation circuit 06) starts oscillating operation again and the light emitting section (14) emits modulated light. The spotlight (6) is a trap so that it can be rotated in the direction in which the modulated light is transmitted to illuminate the target (2). Note that in this embodiment, even if light hits the receiving part t15), the emission of modulated light from the light emitting part (14) does not stop immediately, but the emission of modulated light does not stop after the delay time by the delay circuit 0η has elapsed. Therefore, it is convenient to be able to stop automatic tracking when the target (2) enters the center of the spot.

Next, FIG. 8 shows another embodiment of the present invention, in which a modulated light emitting means (+119) is connected to a spotlight (5) for emitting modulated light in parallel with the light irradiated from the spora 1 light (5). ) and can be rotated together with the spotlight (5).This modulated light emitting means 0
8) has an oscillation circuit (19) that generates a signal of several KHz, a light emitter and a focusing register': j, @t+, and emits the modulated light approximately at the center of the spot at the position of the target (2). They are arranged in such a way that small spots occur. FIG. 9 shows the configuration of the light receiving section (15) of the transmitter (1) in this embodiment, (2 is the photoreceptor, t23 is the amplifying section, and I24 is the amplifying section (23). It is a bandpass filter that extracts only the modulated light component from the modulated light emitting means (18) out of the output of (2) is an averaging circuit that rectifies and smoothes the output of the bandpass filter (24). In this embodiment, the modulated light from the light emitting part (14) is emitted only when a small spot of modulated light formed approximately at the center of the spot of the spotlight (6) hits the light receiving part (15). Since the firing is stopped, the automatic tracking device can be opened before the spot completely leaves the target (2), and the tracking performance of the spot is improved. It is also possible to replace the spot with the modulated light emitting means (18) by making the brightness at the central part of the spot higher than the brightness at the peripheral part. It is only necessary to change the structure so that it is possible to detect that the brightness has decreased compared to the brightness at the other end.

Next, FIG. 10 shows another method for detecting the movement of the transmitter (1), in which the acceleration detecting means (2
Target (2) with built-in transmitter +1+
) moves, the light emitting section 04) is operated to emit modulated light. A vibration detecting means may be used instead of the acceleration detecting means. Figure 11 shows an application example using a mirror (two forces) instead of the transmitter ill of the present invention, and background B is sufficiently dark. In case, mirror (27
The target (2) can be automatically tracked by the reflected light from the target (2). A convex mirror is suitable as the mirror.

Figure 12 shows an application example in which the mirror can reflect modulated light by rotating η at t-3 degrees, and Figure 13 shows a mirror (such as a liquid crystal panel on the front of the mirror). Element whose light transmittance changes depending on an electrical signal (29)
The output of the oscillation circuit (4)) causes the element 9) to be
This example shows an application example in which modulated light can be reflected by periodically changing the transmittance of the light. 14th in Awn et al.
The figure shows an application example in which light from a spotlight (5) is converted into an electrical signal by a solar cell 1) to light up a light emitting part (14). ) The power of the light source that emits light from the side can be saved.

In the detailed explanation of the present invention, the transmitter +11 that emits modulated light is shown, but the transmitter (1)
It is also possible to use a device that emits infrared rays, ultrasonic waves, microwaves, etc.

The present invention is configured as described above, and includes a transmitter held by a target irradiated with a spotlight, a transmission direction detector that detects the direction of a signal transmitted from the transmitter, and a light irradiation direction of the spotlight. In an automatic tracking device, the transmitter receives light from a spotlight,
It is equipped with a light receiving part that stops the transmitter's transmission operation when light is received, so when the target stops and automatic spotlight tracking is not required, the light hits the light receiver and the transmitter's transmitting operation automatically stops. Therefore, it has the advantage that the power consumption of the transmitter held by the target can be reduced.

In addition, when the intensity of the light received from the spotlight at the light receiver is strong, the transmitter's transmission intensity is weakened to avoid unnecessary strong transmission when the distance between the spotlight and the target is short. , the power consumption of the transmitter can be further reduced.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a conventional example, FIG. 2 is a perspective view of an embodiment of the present invention, FIG. 3 is a diagram showing the structure of a transmission direction detector used in the above, and FIGS. 4 and 5 are 6 is a lock diagram of the control unit used in the above, FIG. 7 is a block diagram of the oscillator used in the same, and FIG. 8 is a modulated light emitting means in another embodiment of the present invention. Fig. 9 is a lock diagram showing the structure of the light receiving part of the transmitter used in the above, and Fig. 1 O.
Figures 1 to 14 are a block diagram, a front view, a perspective view, a block diagram, and a block diagram showing different application examples of the transmitter. (1) is a transmitter, (3) is a transmitting direction detector, (4) is Tanabata, (6) is a control section, 04) is a light emitting section, and (+5) is a light receiving section. Agent Patent Attorney Ishi 1) Chief 7 Fig. 1 10- Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 10

Claims (1)

[Claims] fil A transmitter held by a target illuminated by a spotlight, a transmission direction detector that detects the direction of the signal that can be transmitted from the transmitter, and a direction in which the light irradiation direction of the spotlight is directed in the direction in which the signal is detected by the transmission direction detector. In the automatic tracking device, the transmitter is provided with a light receiving section that receives light from the spotlight and stops the transmitting operation of the transmitter when the light is received. Tracking device.