JPH08653Y2 - Structure of light emitting display device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a light emitting display device, and is particularly characterized by the structure of a portion for displaying light output.

[Outline of device]

The present invention is a light emitting display device in which an openable / closable light shielding portion is provided on the light output side of a light emitting display device having a light emitting element output adjusting mechanism, and a light receiving element and a display element are provided in the light shielding portion.

[Conventional technology]

An example of the light emitting display device is an optical pointer or the like used by a speaker when giving a lecture to a large audience at an academic conference.

Such an optical pointer needs to be operated by a battery in order to improve portability, and a light emitting diode or a semiconductor laser has been used as a light emitting element thereof. Further, in recent years, a solid-state laser excited by a semiconductor laser has been miniaturized, and a compact optical pointer using such a fixed laser has been put into practical use.

[Problems to be solved by the device]

In the conventional optical pointer, the light output is adjusted to suit the atmosphere of the lecture hall and the optimum brightness is used.

In that case, the light pointer using the light emitting diode only needs to adjust the brightness, but the laser light pointer using the semiconductor laser or the solid-state laser has a large light output, which may harm the audience. Therefore, it is necessary to operate at a certain light output or less that does not cause harm, and the external laser power meter constantly adjusts and adjusts so as not to exceed the absolute maximum rating of the laser. Further, a light-shielding portion is provided on the light output side so that the laser light is not output when it is not necessary to point even when the laser light pointer is in use.

However, in the case of the prior art laser light pointer,
The laser power meter and the light shielding part are used independently, and it has not been attempted to have both safety and functionality, which is a practical problem.

In addition, automatic power control (hereinafter AP
It is possible to have both safety and functionality with a circuit (abbreviated as C), but the APC circuit increases the number of parts and power consumption, so the load on the power source increases for a small laser light pointer. . In addition, the increase in the number of parts increases the cost and may lead to an increase in the size of the laser light pointer itself.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention provides a light-blocking portion that can be opened and closed on the light output side of a light-emitting element of a light-emitting display device having a light-emitting element output adjusting mechanism, and the light-blocking portion responds to light output of the light-emitting element. Thus, the light emitting display device is configured to include a light receiving element that outputs a current and a display element that displays the output of the light emitting element according to the output current of the light receiving element.

[Action]

According to the present invention, the light emitting display device is configured such that the light output side of the light emitting display device having the output adjusting mechanism of the light emitting element is provided with an openable / closable light shielding part, and the light receiving element and the display part are provided in the light shielding part. This simplifies the calibration and adjustment of the light output of the light emitting display device, and also enables the immediate calibration and adjustment when needed.

〔Example〕

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

1 is a perspective view of a light emitting display device according to a first embodiment of the present invention, and FIG. 2 is a sectional view showing the structure of the light emitting display device of FIG. 3 is a cross-sectional view of the light emitting display device according to the second embodiment of the present invention when a is adjusted and the device is not used, and b is a cross-sectional view when the device is used.

In FIGS. 1 and 2, 1 is a light emitting element, 2 is a drive circuit for the light emitting element, 3 is an optical system, 4a is a protective cap constituting a light-shielding portion, 5 is a light receiving element, 6 is a display element, and 7 is a drive. An adjusting knob for rotating a variable resistor (not shown) with a power switch mounted on the circuit 2, 8 is a main body of the light emitting display device, and 9 is an opening provided on the light output side of the main body 8.

In the light emitting display device of the present invention, the main body 8 is usually covered with the protective cap 4a as shown in FIG. In the operation of the light emitting display device, the user first turns the adjustment knob 7 to turn on the power switch of the variable resistor with the power switch attached to the drive circuit 2 to operate the drive circuit 2. And still rotating the adjustment knob 7 to drive the drive circuit 2
Thus, the current starts to flow to the light emitting element 1 and the driving of the light emitting element 1 is started. By increasing the rotation angle of the adjusting knob 7, the current flowing through the light emitting element 1 is increased to increase the light output of the light emitting element 1. The light emitted from the light emitting element 1 is emitted from the optical system 3.
Then, the light passes through the opening 9 and is input to the light receiving element 5 mounted on the protective cap 4a. The light receiving element 5 outputs a current according to the input light output and displays it on the display element 6. The user rotates the adjustment knob 7 to adjust the light output of the light emitting element 1 displayed on the display element 6 to an appropriate value. Light emitting element 1
After confirming that the light output of was adjusted to an appropriate value,
The user uses the light emitting display device by removing the protective cap 4a.

The light emitting display device of the second embodiment shown in FIGS.
A shutter 4b is provided in place of the protective cap 4a that constitutes the light shielding portion of the first embodiment, and the light receiving element 5 and the display element 6 are attached to the shutter 4b. The operation of the light emitting display device according to the second embodiment is as follows. The shutter 4b is closed to adjust the light output of the light emitting element 1 as in the first embodiment as shown in FIG. When the light output reaches a proper value, the shutter 4b is opened and the light emitting display device is used as shown in FIG.

The light emitting device 1 of the present invention may use any of the light emitting diode, the semiconductor laser, and the solid-state laser described in the prior art. However, when a solid-state laser is used, a semiconductor laser is mounted in the drive circuit 2, the optical output of the semiconductor laser is adjusted by the drive circuit 2, and the optical output of the solid-state laser excited by the semiconductor laser is adjusted. As the light receiving element 5, a photodiode is used when the light emitting element 1 is a light emitting diode, and a solar cell is used when the light emitting element 1 is a laser. The display element 6 can be easily displayed by using a small meter. If the light emitting element 1 is a laser, the safety area of the light output is displayed in green by the output current from the light receiving element 5, and the dangerous area is displayed in red. It can give a feeling. In addition, a combination of two LEDs, a current limiting element and a voltage limiting element is used for the display element 6, and only one of the LEDs is turned on by the current output from the light receiving element 5 according to the safe area and the dangerous area of the light output. It is also possible to display the safety area and the dangerous area.

[Effect of device]

According to the present invention, the light emitting display device is configured such that the light output side of the light emitting display device having the output adjusting mechanism of the light emitting element is provided with an openable / closable light shielding part, and the light receiving element and the display part are provided in the light shielding part. This makes it easy to calibrate and adjust the light output of the light emitting display device, and allows immediate calibration and adjustment when necessary, so that the light emitting display device can be used with an optimum light output. In particular, in the case of a light emitting display device using a laser, the user can feel secure.

[Brief description of drawings]

FIG. 1 is a perspective view of a light emitting display device according to a first embodiment of the present invention, FIG. 2 is a sectional view showing a structure of the light emitting display device of FIG. 1, and FIGS. FIG. 3 is a cross-sectional view of the light emitting display device of the example. In the figure, 1 ... Light emitting element 2 ... Driving circuit 3 ... Optical system 4a ... Protective cap 4b ... Shutter 5 ... Light receiving element 6 ... Display element 7 ... Adjustment knob 8 ... Main body 9 ... Opening Is.

Claims (1)

[Scope of utility model registration request] 1. A light emitting display device having a light emitting element output adjusting mechanism, wherein an openable / closable light shielding portion is provided on a light output side of the light emitting element, and the light shielding portion is provided in accordance with a light output of the light emitting element. A structure of a light emitting display device comprising: a light receiving element that outputs a current; and a display element that displays an output of the light emitting element according to an output current of the light receiving element.