JPH03130745A - Device for projecting cassette file information - Google Patents

Abstract

PURPOSE:To enlarge and project information to an external screen set at the back by attaching the back plate of a main body having a reflection mirror so that it can be attached to and detached from the main body. CONSTITUTION:The back plate 40 is attached to and detached from an upper case 20 by inserting in and pulling out an engagement part 42 to the hole 23a of an abutting part 23. In the case that the back plate is attached, the recorded image of a tape 4 is reflected on the reflection mirror 43 and projected to a screen 21 provided in the case 20 through an projection optical system 13 by a luminous flux emitted from a halogen lamp 12. Meanwhile, in the case that the back plate 40 is detached, the recorded image of the tape 4 is projected to the external screen 50 through the projection optical system 13 by the luminous flux emitted from the lamp 12. In such a case, the optimum image is projected by increasing the emitted light quantity of the lamp 12 and focusing a lens 13a.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention applies a recorded image on a tape of a memory cassette to a screen provided on the front of the main body via a projection optical system and a reflecting mirror using a beam of light emitted from a light source. The present invention relates to an improvement of a cassette file information projection device.

[Prior Art] As this type of cassette file information projection device, there is one shown in FIG. 6, for example.

The cassette file information projection device (projection device) includes a hollow main body 1 consisting of a lower case 1a and an upper case 1b, and the lower case la is provided with a loading mechanism 3 for loading a memory cassette 2. There is.

In this loading mechanism 3, a cassette holding frame 3a whose upper surface is an operation panel section is opened upward as shown by a two-dot chain line by operating a key on the operation panel section.

Then, insert the memory cassette 2 into the upwardly opened cassette holding frame 3a from the direction of the arrow in the figure, and insert it into the cassette holding frame 3a.
By closing the memory cassette 2, the memory cassette 2 is loaded.

As shown in FIG. 7, the memory cassette 2 includes a cassette main body 2a whose negative side is open, tape reels 2b, 2b provided on the cassette main body 2a, tape guide rollers 2c, 2c, and a tape reel. 2b, 2b
The tape 4 has both ends fixed to the tape 4 and is supported by rollers 2c, 2c, and a tape guard lid 2d for opening and closing the open end of the cassette body 2a. The lid 2d is attached to both sides of the cassette body 2a via a support shaft 2e so as to be vertically movable. In such a configuration, the mechanical parts other than the tape 4 have almost the same structure as a videotape cassette.

As shown in FIG. 8, the tape 4 includes a magnetic recording section 4a,
It has an organic photoconductor (OPC) tape section, that is, an optical information recording section 4b. The optical information recording section 4b is an information recording image section 4c in which a large amount of information is recorded.
and an image position detection mark 4d provided corresponding to each information recording image portion 4C. For example, one page of a document or the like is imprinted as a positive photograph in each information recording image section 4C. Furthermore, information corresponding to each information recording image section 4c is recorded in the magnetic recording section 4a.

The cassette file information recorded on the tape 4 is displayed as a projected image by a projection device.

As shown in FIG. 7, when loading the memory cassette 2 into the projection device, first open the cassette holding frame 3a by operating the keys on the operation panel to insert and hold the memory cassette 2, and then open the cassette holding frame 3a. Close to the dashed line 0
Next, by operating the keys on the operation panel section, the magnetic recording section 4a is
The recorded contents are read by a magnetic head (not shown) and stored in a memory. A projection image is designated based on the read content, and the tape 4 is driven by a drive means (not shown).

At this time, each image position detection mark 4d is detected and counted by an optical sensor (not shown). When the count reaches the specified number, the running of the tape 4 is stopped. After stopping, the light source 5 disposed in the lower case 1a corresponding to the loading position of the memory cassette 2 is turned on, and the light from the light source 5 illuminates the designated information recording image section 4C via the condenser lens 6. Information recording image section 4C
The light flux that has passed through the optical system 7 and the recorded image are projected onto a screen 9 via a projection optical system 7 and a reflecting mirror 8 .

[Problems to be Solved by the Invention] However, conventional projection devices can only project images recorded in a memory cassette onto a screen built into the projection device; There was a problem in that it was impossible to project onto an external screen.

On the other hand, an overhead projector (OHP) that can project onto an external screen installed at any location.
) mainly involves enlarging and projecting A4 size paper, and in addition, the paper must be transparent, which poses a problem in that there are many restrictions on projection.

Furthermore, most were large devices intended for projection onto large external screens.

The present invention has been made in view of the above problems, and its purpose is to provide a function as an OHP in addition to a function as a cassette file information projection device, and to provide a recording image condensed in a memory cassette. The purpose is to make it possible to project images onto a large external screen. Another object of the present invention is to provide a cassette file information projection device that can automatically adjust the amount of light from a light source to an optimal state depending on each projection state.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a method for recording an image on a tape of a memory cassette on the front surface of the main body through a projection optical system and a reflecting mirror using a light beam emitted from a light source. In a cassette file information projection device that projects onto an external screen, the back plate of the main body, which has a reflective mirror, is removably attached to the main body so that the recorded image can be enlarged and projected onto an external screen installed at the rear of the main body. It is characterized by: Further, the cassette file information projection device is characterized by being provided with a detection switch that detects that the back plate is removed and outputs a detection signal, and a light intensity increasing means that increases the light intensity of the light source in response to the detection signal. That is.

[Function] With the cassette file information projection device configured as described above, the recorded image of the memory cassette can be projected onto the screen built into the projection device by attaching a back plate with a reflective mirror attached to the main body. . On the other hand, remove the back plate with the reflective mirror attached to open the back of the main unit.
This allows recorded images to be enlarged and projected onto an external screen installed behind the main body. At this time, the amount of light from the light source is automatically changed by attaching and detaching the back plate, making it possible to obtain a projected image with appropriate illuminance depending on the projection state.

[Example] Hereinafter, an example of the present invention will be described based on FIGS. 1 to 5.

As shown in FIGS. 1 and 4, the cassette file information projection device (projection device) is equipped with a hollow main body 3o consisting of a lower case 1o and an upper case 20.

The lower case 10 has an inclined wall 10a on the front,
A recess 10b in which the memory cassette 2 shown in FIG. 8 is accommodated by a loading mechanism is formed in the inclined wall 10a.

A condenser lens 11 is fixed to the back side of the bottom wall of the recess 10b (inside the lower case 1o), and a halogen lamp 12 as a light source is installed below the condenser lens 11, and a halogen lamp 12 is installed diagonally above the condenser lens 11. A projection optical system 13 is provided. The projection optical system 13 includes
A focus lens 13a is provided for focus adjustment. When the memory cassette 2 is loaded into the recess 10b, the tape 4 of the memory cassette 2 is positioned between the condenser lens 11 and the projection optical system 13, as in the conventional example.

The upper case 20 has a screen 21 on the front side 20a, and a back plate 40 is removably attached to the back side 20b. The rear end of the top plate 20c is provided with two stop portions 22 that have holes 22a and protrude rearward, and the bottom of the back surface 20b has an abutment portion 23 for receiving the bottom portion 40a of the back plate 40. It is formed. The contact portion 23 has two holes 23a into which retaining portions 42, which will be described later, are inserted.

The back plate 40 shown in FIG. 2 has two recesses 41 formed with female threads 41a in the upper part, and has two recesses 41 in the lower part.
Two engaging portions 42 protruding downward are provided. A reflecting mirror 43 facing the projection optical system 13 is attached to the back plate 40 on the front side 40a that faces the screen 21 with the back plate 40 attached to the upper case 20. Then, the back plate 40 connects the engaging portion 42 to the abutting portion 23.
At the same time, the locking part 22 is placed on the upper surface of the recess 41 as shown in FIG.
7 into the female threaded portion 41a, the upper case 2
Attached to 0.

Therefore, when the back plate 40 is attached, as shown in FIG.
3 and is reflected by a reflecting mirror 43 and projected onto a screen 21 provided on the upper case 20. On the other hand, back plate 4
0 is removed, as shown in FIG. Become.

Further, a back plate 40 is provided at the bottom of the back surface 20b of the upper case 20.
A back plate switch 31 that detects attachment/detachment of and outputs a detection signal.
is installed. For example, when the back plate 40 is attached, the back plate switch 31 is pressed by the back plate 40 and turned ON (see Figure 1), and when the back plate 40 is removed, it is released and turned ON.
It is set to perform FF (see Fig. 4).

The amount of light from the halogen lamp 12 is controlled by the control circuit by setting the back plate switch 31 to 0N10FF. FIG. 5 shows the configuration of the control circuit.

In FIG. 5, 32 is a transistor that becomes conductive when the back plate switch 31 is closed, 33 closes a contact when the collector potential of the transistor 32 becomes high, and closes a contact H when the collector potential becomes low. The relay switch 34 is constructed as follows: A projection switch (not shown) and a pressing frame (not shown) press the tape 4 onto the condenser lens 11, and the switch circuit is closed when the projection switch is operated. 35 is a power source for the light source, and 36 is a cement resistor.

When the back plate switch 31 is closed, that is, when the back plate 40 is attached, the transistor 32 becomes conductive, the collector potential becomes low, and the contact of the relay switch 33 is closed. When the switch circuit 34 is closed, current from the light source power supply 35 flows to the halogen lamp 12 via the cement resistor 36 .
2 lights up, the recorded image on the tape 4 is projected onto the screen 21 via the projection optical system 13 and the reflection mirror 43.
projected on. The cement resistor 36 is a halogen lamp 1
The resistance value is set so that the screen 2 which enters the projection state when the screen 2 is turned on has an optimum brightness.

On the other hand, when projecting the recorded image on the tape 4 onto an external screen 50 provided outside the projection device flA, the back plate 40
At this time, when the back plate switch 31 is turned OFF, the FFL transistor 32 becomes non-conductive, the collector potential becomes high, and the contact H of the relay switch 33 is closed. Therefore, since the current from the light source power supply 35 directly flows through the halogen lamp 12, the amount of light emitted from the halogen lamp 12 increases compared to when the relay switch 33 is located on the L side.

That is, the relay switch 33 has a function as a light amount increasing means for increasing the light amount of the halogen lamp 12, and the light amount is automatically adjusted to the optimum state according to each projection state. A recorded image is projected onto the external screen 50 with this increased amount of light. In this case, by adjusting the focus of the focus lens 13a provided in the projection optical system 13, an optimal projection image can be projected on the external screen 50.

[Effects of the Invention] As explained above, the present invention provides a cassette file that projects recorded images of a memory cassette onto a screen provided on the front surface of the main body using a beam of light emitted from a light source via a projection optical system and a reflecting mirror. An information projection device characterized by a back plate of the main body having a reflective mirror attached to the main body in a removable manner so that recorded images can be enlarged and projected onto an external screen installed at the rear of the main body. It is.

Further, the cassette file information projection device is characterized by being provided with a detection switch that detects that the back plate is removed and outputs a detection signal, and a light intensity increasing means that increases the light intensity of the light source in response to the detection signal. That is.

Therefore, in addition to the function as a cassette file information projection device, it can also be equipped with an OHP function, making it possible to project images recorded in a memory cassette onto an external large screen, and the light intensity of the light source. automatically adjusts to the optimum state according to each projection state.

A side view of the device; FIG. 2 is a perspective view of the back plate shown in FIG. 1;
Fig. 3 is an explanatory diagram showing the mounting state on the upper part of the back plate, Fig. 4 is a side view of the cassette file information projection device showing the state of projection onto an external screen, Fig. 5 is a control circuit diagram, and Fig. 6 is a conventional FIG. 7 is a side view of the cassette file information projection device, FIG. 7 is a perspective view of the memory cassette, and FIG. 8 is an explanatory diagram of the tape shown in FIG.

2... Memory cassette 4... Tape 12... Halogen lamp (light source) 13... Projection optical system 21... Screen 30... Main body 31... Back plate switch (detection switch) 33. ... Relay switch (light intensity increasing means) 40 ... Back plate 43 ... Reflection mirror 50 ... External screen A ... Cassette file information projection device Fig. 1

Claims (2)

[Claims] (1) A cassette file information projection device that projects a recorded image on a tape of a memory cassette onto a screen provided on the front of the main body using a light beam emitted from a light source via a projection optical system and a reflecting mirror. A cassette file information projection device characterized in that a back plate of the main body having the reflecting mirror is detachably attached to the main body so that the image can be enlarged and projected onto an external screen installed at the rear of the main body. (2) A claim characterized in that a detection switch that detects that the back plate is removed and outputs a detection signal, and a light amount increasing means that increases the amount of light from the light source in response to the detection signal are provided. Cassette file information projection device according to item 1