JPS5851267B2 - optical display device - Google Patents

Description

[Detailed description of the invention] The present invention relates to optical displays such as optical characters.

A device as shown in FIG. 1 is known as an optical character display device used in bank terminal devices.

1 is a character disk on which characters, etc. are printed in micropatterns, 2 is a light source, 3 is an objective lens for enlarged projection, 4 is a screen, 5 is a pulse motor for rotating and positioning the character disk 1, and 6 is a motor as described below. A control circuit rotates the pulse motor 5 by a certain amount based on the position command input terminal 7, and 7 is a position command input terminal.

On the character disk 1, a necessary number of frames 13 constituting a group of characters to be simultaneously projected onto the screen are concentrically imprinted (FIG. 2).

When a character to be projected is specified by the position command input terminal 7, a constant amount of pulses are applied to the pulse motor 5 by the control circuit 6, and the character disk 1 is stopped at a predetermined position.

In this position, the micropatterned characters in the corresponding frame 13 are illuminated by the light source 2 and the objective lens 3
The image is enlarged and projected onto the screen 4.

Note that the pulse motor drive amplifier is omitted in the figure.

In such a device, in order to increase the number of frames 13, either the diameter of the character disk 1 is increased or the characters are made smaller, but the former results in an increase in size.

Further, in both cases, a limit is given by the number of steps per rotation of the pulse motor 5.

An object of the present invention is to provide a set of letter disks in which frames are arranged concentrically and one of the frames is a transparent frame that transmits light, and the frame of one disk and the frame of the other disk are arranged concentrically. To provide an optical display device in which a transmitting frame of a disk is arranged so as to be on the optical axis of a projection optical system at the same time, so that a larger number of frames can be included without enlarging the shape of the disk.

The present invention will be explained according to one embodiment of FIG.

In the figure, 11 and 12 are character disks.

As shown in Fig. 4, character frames 13 are concentrically imprinted along each circumference, and certain frame positions 14 are transparent frames to allow light to pass through. There is.

A set of character discs is arranged so that each frame of the character discs 11 and 12 is located at a prescribed position on the optical axis of the projection optical system and is correctly projected onto the screen (Fig. 5). .

In the case of Fig. 3, the characters on the character disc 11 are on the light source 2 side, and the characters on the character disc 12 are on the projection lens 3 side. uses an erect projection lens.

). 2.3.4 are a light source, a projection lens, and a screen, respectively, as in Fig. 1.

5a, 5b are the same as the pulse motors 5 in FIG. 1, and are each independently connected to the character disks 11 and 12.

Reference numeral 6a denotes a control circuit, which controls the pulse motor 5a by means of a position input command terminal 7.

5b is the same as the control circuit 6 in FIG. 1, but as will be described later, the pulse motors 5a and 5b are selectively driven depending on the magnitude of the position input command end 7 from a certain amount.

Next, the basic parts of the present invention will be explained using FIGS. 3 and 4.

Now, consider the case where a frame on the character disk 11 is projected.

In this case, the rotation of the Uharus motor 5b is controlled so that the transparent frame 14 of the character disk 12 is positioned on the optical axis.

If the character disk 11 is controlled to be positioned in the specified frame 13 in this state, the characters on the character disk 11 will be projected onto the screen 4 since the character disk has a transparent frame. .

Conversely, when projecting a frame on the character disk 12, the character disk 11 may be positioned on the transparent frame.

Here, if the mechanical air gap between the character discs 11 and 12 is A (FIG. 7), the thickness of the transparent frame 14 provided on the character disc 11 is made thinner by Δd. do.

However, the optical refractive index of the character disk 11 is assumed to be N.

By satisfying the following, the character disk 12 can be projected without being out of focus, similar to the projection of the character disk 11, while the projection lens 3 remains fixed.

Next, an example of the configuration of the control circuit 6a is shown in FIG.

Now, assume that the number of frames on the character disks is n for both character disks 11 and 12, and that the no-th frame is the transparent frame 14.

Also, let n be the frame to be specified.

A comparator 62 has a position command input and a comparator n. Compare with n
Kun.

(If n>no, output is generated from 67.

Reference numerals 64 and 68 denote gate circuits which gate the position command signal through outputs 63 and 67, respectively.

65.70 is also a gate circuit, and each output 63.67 opens and closes the gate, but in this case, 63, 70.67, and 65
are combined.

72 is n. generate a position command signal corresponding to the value of n
.

It is a setting device. 66 is an OR circuit and gate circuit 64 or 6
5 signal is passed.

71 is also an OR circuit 2 and a gate circuit 70 or an arithmetic unit 6 to be described later.
Passes the signal from 9.

The calculator 69 calculates n no when the position command signal becomes n > no, and one revolution of the pulse motor 5b is a no frame. Position accordingly.

6a is the same control circuit as that shown in FIG. Now, when a position n command is given from the position command input terminal 7, the comparator 6
2 and n.

If the comparison is negative, the gate circuit 64 is opened and the position command n is passed through the OR circuit 66 to the control circuit 6a.
and controls the pulse motor 5a to rotate to the n position.

In this case, since the gate circuits 65 and 68 are closed, the n position command and the no setting signal are not supplied, respectively.

On the other hand, the gate circuit TO is opened and n from the setter 72 is
.

The position command passes through the OR circuit 71 to the control circuit 6.
A is supplied to the pulse motor 5b, and the character disk is connected to the pulse motor 5b.

, that is, the transparent frame.

In this way n < n.

In this case, the characters on the character disk 11 are projected onto the screen.

If n > no, then n < n.

Since the operation is the opposite of that in the case of , the explanation will be omitted.

Here, in the case of n:no, since both character disks correspond to the transparent frame, it goes without saying that this position is not used as a command.

Here, the case where the number of frames of the character disks 11 and 12 are equal is shown.

However, the no setting device 72 is set to n. If two gate circuits 1jnQ2 are provided and their outputs are supplied to the gate circuits 65 and 70, the number of frames of the character disk 11 can be n.

1. The number of frames of the character disk 12 is n. 2, and it is not necessary for both numbers of frames to be equal.

Although an example of a control circuit for carrying out the present invention has been described above, various other methods can be considered.

However, since the gist of the present invention is not affected in either case, the explanation will be omitted.

The above-described configuration of the present invention allows optical projection displays, such as those using commercially available pulse motors, to have a greater number of frames and, in some cases, to be smaller in size.

In addition, the access time (calling time) required for positioning is also reduced because two pulse motors are rotated at the same time.
Even though the number of frames is almost twice as large as that in the case of a single character disc, it takes about the same amount of time as in the case of a single character disc.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of a conventional optical display device, and Figure 2 is an explanatory diagram of a conventional optical display device.
FIG. 3 is a detailed explanatory diagram of the present invention; FIG. 4 is an explanatory diagram of the character disc in FIG. 3; FIG. 5 is an explanation of the arrangement positions of both character discs. 6 are diagrams showing an example of a control circuit used in the present invention, and FIG. 7 is an explanatory diagram showing correction of the optical path length. Explanation of symbols of main parts, 3...Objective lens, 4
...Screen, 11,12...Character disk, 13...Character frame, 14...
- Transparent frame, 5a. 5b...Pulse motor.

Claims (1)

[Claims] 1. In an optical display device that enlarges and projects micro-patterned characters, etc. on a transparent disk, a plurality of character frames are arranged concentrically along the circumference, and one of the frames transmits light. An optical display device comprising a pair of discs each having a transmission frame arranged such that the frame of one disc and the transmission frame of the other disc are located on the optical axis at which projection is to be performed simultaneously.