JPH01112482A - Device for adjusting optical axis - Google Patents

Abstract

PURPOSE:To attain the exact adjustment of the optical axis matching of a sensor by covering a base where a driving part is loaded with a cover, supporting pivotally a head burying a dimming type sensor, so as to be protruded from the cover and further, allowing the base to be freely rotatable. CONSTITUTION:A dome-shaped head 2 burying the dimming type sensor is freely rotated with an axis 3a for pivoting to a supporting shaft 3 as a center by a step motor 7, a warm gear 71 and gears 51, 52 and 55, etc. On the other hand, the base, where the driving parts of the step motor, a warm gear 61 and a warm wheel 41, etc., are loaded is turned through these parts and the optical axis matching of the sensor is exactly adjusted. This base is covered with a cylinder-shaped cover 8 having an aperture. Then, when the head 2 is protruded from this aperture, and only the head 2 is protruded by burning the cover 8 in a wall or a ceiling, the title device is prevented from being prominent as a whole and it is miniaturized practically.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an optical axis adjustment device that accommodates and uses a dimming type sensor or the like.

[Background technology]

As shown in FIG. 10, a conventional dimming type sensor is provided with a pair of reference holes 212, 212 in a projector or receiver main body 215 having a light emitting element or a light receiving element 211. By looking through 212, lens 2
10 optical axis alignments were performed. In this case, first loosen the ball joint 214 interposed between the main body 215 and the ceiling surface 213, align the optical axis, and then
14, but not only is it time-consuming to make delicate adjustments, but the optical axis tends to shift again when tightening the ball joint 214, and the delicate work is difficult if the installation location is high. There were some problems, such as difficulty.

In addition, this type of dimming type sensor has a structure in which it is attached to a ceiling or wall and used with the main body exposed, so there is a problem that its presence is conspicuous.

[Purpose of the invention]

The present invention was developed in view of these circumstances, and
To provide an optical axis adjustment device which can accurately adjust the optical axis alignment of a dimming type sensor and is not noticeable even when installed.

[Disclosure of the invention]

The present invention proposed to achieve the above object has a dome-shaped base equipped with a drive unit and covered with a cylindrical cover having an upper opening, and a dome-shaped base with a built-in dimming type sensor via a mounting column. The head is pivotally mounted so as to protrude from the upper opening of the cover, the base is rotatable, and the head is adjustable in rotation.

〔Example〕

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a partially cutaway perspective view showing the main structure of the optical axis adjustment device of the present invention.

1 is a disc-shaped base on which a driving section (F-), which will be described later, is mounted;
Two mounting support plates 3.3 are fixed to the peripheral edge of the base 1, and a pivot 3a is attached to the end of the support plate 3.3 so that the base of the dome-shaped head 2 can be rotated. , 3a.

゛The dome-shaped head 2 has a core hole 2a that allows the sensor to face the appropriate position of the dome body, and the inner space has a
In order to install the dimming type sensor so that its optical axis is facing, a mounting base 2b is provided as shown in Fig. 3.
Mount the sensor 9 on this mounting base 2b! A printed circuit board necessary for control is attached (see Figure 5).

The drive unit mounted on the base 1 includes two step motors 6.7 attached to the base 1, each of which has a first gear mechanism 4 that rotates the base 1, and a first gear mechanism 4 that rotates the head 2. The rotational force is transmitted to the second gear mechanism 5 that causes the rotation to occur.

As shown in FIG. 2, the first gear mechanism 4 engages a worm 61 attached to the rotating shaft of the step motor 6 with a worm wheel 41 fixed to a protrusion 42 fixed to a cylinder bottom 81. The support cylinder 43 fixed to the base 1 side has a hair ring 44 with respect to this protrusion 42.
It is possible to rotate through. Therefore, when the step motor 6 is rotated in the forward and reverse directions, the base 1 rotates to the right and left around the protrusion 42.

In addition, in order to prevent continuous rotation of the base l by the first gear mechanism 4, a detection means such as a proximity switch is provided on the base 1 and the cylinder bottom 81 to define the starting and ending positions during forward and reverse rotation. There is.

Further, as shown in FIGS. 2 to 4, the second gear mechanism 5 is a separate gear mechanism attached to the base 1 so as to face the step motor 6 across the worm wheel 41. A worm 71 fixed to the rotating shaft of the step motor 7 is meshed with a worm wheel fixed to a shaft 53 which is rotatably supported by the two support plates 3.3. A gear 52 fixed to the end of a rod 53 is further meshed with a gear 55 fixed to the head 2 side with bolts and nuts 56.

The base 1 is covered with a cylinder cover 8 having an upper opening 8a, and the cylinder cover 8 is fixed to the cylinder bottom 81 fixed to the base 1 with screws 83. This cylinder cover 8
It has a structure in which it protrudes from the upper opening 8a.

In order to prevent the tilting control of the head 2 by the second gear mechanism 5 from exceeding the permissible range, the head 2 and the base 1 are provided with detection means such as a proximity switch.
It defines the start and end positions of the rotation range.

According to the optical axis adjustment device of the present invention having such a structure, when the step motor 6 is driven in the forward and reverse directions, the base 1 moves between A and A.
'Since it rotates in the force direction (see Figure 1), the head 2 also rotates together with it. Furthermore, when the step motor 7 is driven in the forward and reverse directions, the head 2 tilts in the B and B' force directions (see Figure 1). Can be positioned in rotation and tilt.

FIG. 5 shows an example of the use of the optical axis adjusting device of the present invention, and if the entire cylinder cover 8 is embedded in the wall,
Since only the head 2 is exposed from the wall surface 10, it is less noticeable when installed compared to conventional ones.

In the apparatus of the present invention as described above, if the optimal position of the dimming type sensor is stored in advance using a microcomputer or the like, the same position can always be reproduced.

Next, a specific method of controlling optical axis alignment using the apparatus of the present invention will be explained.

First, referring to FIG. 6, we will explain the general procedure for aligning the optical axis of this type of dimming type sensor. For example, the receiver is installed at a distance of about 100 meters, and a power supply current is constantly supplied from the receiver through a signal line that sends an alarm signal when smoke is detected.

A high-frequency modulated optical signal is intermittently transmitted from the emitter 101, and the optical receiver 102 amplifies and detects the received optical signal, converts it from A/D, and determines the level using a level determination circuit using a microprocessor. If the level is below a certain level, an alarm signal is sent to the receiver 104. The level judgment circuit is equipped with a ROM memory that stores programs, and a RAM memory that stores data such as the standard operating light receiving amount for abnormality detection and the critical operating light receiving amount that determines the tolerance range for lens dirt etc. . The program is
It has three functions: adjustment, monitoring, and function check, and the functions are switched using a changeover switch.

Although the optical axis adjustment device of the present invention can also perform optical axis alignment using the above-described procedure, a highly accurate adjustment method using a microprocessor will be described next.

FIG. 7 is an explanatory diagram of the operating principle in that case.

First, there are floodlights each with a built-in dimming sensor.

After installing the optical axis adjustment devices of the present invention, which constitute a light receiver, to face each other, an optical axis adjustment program is executed, and a control signal is sent to the step motor of the optical axis adjustment device A on the receiver side. As shown in Figure 7, the optical axis is sequentially moved from rlJ to “25
'', the received light signals in each direction are A/D converted and stored in the RAM memory as 25 pieces of data. Next, the largest one of these 25 pieces of light reception amount data is selected to determine the maximum light reception direction, and the step motor is driven again to direct the optical axis adjustment device to the rad 2 in the maximum light reception direction. When the optical axis adjustment on the projector side is completed in this way, the optical axis adjustment device on the receiver side is also adjusted in the same manner as described above, and the program operation is completed.

In the example shown in FIG. 8, the adjustment work is divided into two stages so that fine adjustments can be made. In the figure, if in the first stage of adjustment, for example, the direction indicated by number 8 has the maximum amount of light received, in the second stage this direction is further adjusted to r8-IJ.
, ``8-2J, .
Collect five pieces of received light amount data, and center the head of the optical axis adjustment device in the direction of the maximum received light amount data. When optical axis alignment is performed using such a method, for example, by initially installing the light emitter and light receiver within an error range of +5 degrees, optical axis alignment can be performed with an accuracy of 0.2 degrees.

In the example shown in FIG. 9, a lamp is displayed to indicate that the maximum light receiving direction is outside the adjustable range, so that correction of the installation direction can be instructed.

Now, if one of the 16 outermost directions among the 25 divided directions shows the maximum light receiving point (2), there is a possibility that the maximum light receiving point exists further outside of that direction.

In such a case, the direction to be corrected is displayed using an indicator lamp 15 as shown in FIG. 2(b), for example. If the direction of maximum light reception is at the four corners, it is sufficient to display with two lamps.

For example, in the case of "1", the "top" and "left" lamps are lit to display the correction diagonally, r2J, r
In the case of 3J and r4J, turn on the "upper" lamp.

According to such a method, even if there is a large deviation from the initially set position, this is automatically detected, so that the installation work can be carried out with peace of mind. In addition, Figures 8 and 9
If you use the methods shown in the figure together, you can achieve the Ji effect.

As described above, according to the optical axis adjusting device of the present invention, the amount of light received in each direction is stored in the memory while rotating the head in multiple steps vertically and horizontally, and the optical axis is adjusted in the direction in which the maximum amount of received light is detected. can be set, so the optical axis will not shift due to vibrations caused by tightening ball joints, etc., as in the past, and the automation of optical axis alignment can be achieved with an extremely simple operation, reducing the hassle of adjustment work at the installation site. can be omitted.

〔Effect of the invention〕

According to the optical axis adjustment device of the present invention, the head can be directed to any position within a predetermined range by controlling the step motor, so that the troublesome work required in the conventional method is not required.

In addition, the base on which the drive unit is mounted is housed in a cylinder cover, and the cylinder cover is embedded in a wall or ceiling.
Since it can be used with only the head protruding, it is not noticeable when installed.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway schematic perspective view showing the main parts of the device of the present invention, Fig. 2 is a schematic longitudinal cross-section showing the structure of the drive section, and Fig. 3 is a longitudinal cross-section showing the schematic structure of the gear mechanism for tilting the head. side view,
Fig. 4 is a diagram showing the arrangement relationship of the step motor, Fig. 5 is an explanatory diagram of an example of installation use, Fig. 6 is an explanatory diagram of the principle of optical axis alignment of a dimming type sensor, Figs. 7, 8, FIG. 9 is an explanatory diagram of optical axis alignment control of the optical axis adjustment device, and FIG. 10 is an explanatory diagram of optical axis alignment by a conventional method. (Explanation of symbols) 1...Base 2...Head 2a...Window hole 3...Mounting column 4...First gear mechanism 5...Second gear mechanism 6.7...・Step motor 8... Cylinder cover 8a... Its upper opening

Claims (2)

[Claims] (1) A dome-shaped head with a built-in dimming sensor is protruded from the upper opening of the cover via a mounting column on a base that is equipped with a drive unit and covered with a cylindrical cover having an upper opening. An optical axis adjusting device which is pivotally mounted in this manner, and which enables the base to rotate and the head to be tilt adjustable. (2) The drive section is configured using two step motors, and each step motor controls the rotational position of the base and the tilt angle of the head through first and second gear mechanisms, respectively. The optical axis adjusting device according to claim 1, wherein the optical axis adjusting device is configured to independently control the following.