JPH0738913Y2 - Transparent document projection device in document reading device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a transparent original projection device in an original reading device such as an analog copying machine or a digital copying machine.

[Conventional technology]

Conventionally, as a transparent original projection device in this type of original reading device, the reflection surface of the reflection surface unit is made foldable with respect to the coupling optical system side, and when not in use, it is detached from the original placing table of the copying machine main body and stored. Model (Japanese Patent Laid-Open No. 59-19
No. 8440, Japanese Patent Laid-Open No. 59-198441), and the reflecting surface unit and the projection apparatus main body are connected via a connecting means, and the reflecting surface unit is folded when not in use to project the projection apparatus. Models stored inside the main body (Japanese Patent Laid-Open No. 59-
No. 198439).

[Problems to be solved by the device]

When the reflection surface unit portion of the transparent original document projection device and the projection device main body of the conventional document reading device are connected, and the reflection surface unit portion is folded and moved between the projection surface device main body and the projection device main body, the connection optical of the reflection surface unit portion is used. The system is configured to slide on the platen glass and easily damage the surface of the coupling optical system formed of a resin such as acrylic.

The present invention relates to a connecting optical system formed by a resin such as acrylic when the connecting optical system of the reflecting surface unit portion of the transparent original projecting device arranged in the original reading device is placed on the original table or a surface other than the original table. The aim is to provide a means which does not damage the surface of the system.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention provides a transmissive original document projection apparatus comprising a projection apparatus main body having an illumination optical system and an imaging optical system, and a reflective surface unit section having a reflective surface and a coupling optical system. The reflecting surface unit portion is characterized in that the connecting optical system is supported by means capable of vertically displacing with respect to the frame-shaped substrate portion of the reflecting surface holding member,
Further, as a means for vertically displacing the coupling optical system with respect to the frame-shaped substrate portion, between the frame-shaped substrate portion and the coupling optical system,
It is characterized by comprising an eccentric cam biased in one direction and a detection lever member capable of restricting the movement of the eccentric cam by bringing the reflecting surface unit part into contact with and separating from the document table.

Further, the present invention is a transmissive original document projection apparatus comprising a projection device body having an illumination optical system and an imaging optical system, and a reflection surface unit portion having a reflection surface and a coupling optical system. The reflecting surface is fixedly held by the surface holding member and the connecting optical system is supported, and the reflecting surface holding member is supported so as to be vertically movable with respect to the unit side plate located on the document table. .

[Action]

According to the configuration of the present invention, the connecting optical system is supported on the frame-shaped substrate portion of the reflecting surface holding member having the reflecting surface so that the connecting optical system can be displaced, and only the connecting optical system or the connecting optical system and the reflecting surface are simultaneously manuscript. It can be brought into contact with or separated from the surface of the table, and the surface of the coupling optical system can be protected. Further, as a means for displacing the coupling optical system with respect to the frame-shaped substrate portion, the movement of the eccentric cam is regulated by moving the eccentric cam biased in one direction and the frame-shaped substrate portion to and from the document table. When the frame-shaped substrate section is separated from the document table by the detection lever member that operates, the connection optical system is separated from the document table, and when the frame-shaped substrate section is placed on the document table,
The connection optical system can be positioned so as to contact the document table side.

〔Example〕

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

In FIG. 1, a transparent document projection device base 2 on which a transparent document projection device can be placed is provided on the side of the document reading device 1.

This transparent original projection device is provided on the transparent original projection device main body (hereinafter referred to as the projection device main body) 3 fixedly provided on the transparent original projection device stand 2 and on the original reading device 1 when the transparent original is read. The first position (solid line position in FIG. 1) placed on the document table 13 apart from the projection apparatus main body 3 that can be read by the imaging optical system 11 and the image sensor 12, and the projection apparatus when not reading. The reflecting surface unit 4 is used by moving to a second position (dashed line position in FIG. 1) that can be coupled to the front end of the main body 3.

The projection apparatus main body 3 is provided with an illumination optical system 33 that illuminates a transparent original 32 mounted in the transparent original mounting port 31, and an image forming optical system 34 that forms an image on the transparent original 32. Reflective surface unit 4
Is provided with a reflecting surface 41 for directing the light beam emitted from the image forming optical system 34 to the document table 13, and a connecting optical system 42 for forming a transmitted document image on the document table 13.

A Fresnel lens or a diffusing plate is used as the coupling optical system 42.

In the reflecting surface unit 4, the reflecting surface 41 and the coupling optical system 42
And a holding member 43 for mounting the
The reference numeral 43 includes a frame-shaped substrate portion 44 that abuts on the document table 13, and a reflecting surface attachment portion 45 that extends from one end of the frame-shaped substrate portion 44 at a predetermined angle (45 degrees).

The reflecting surface 41 is fixed to the reflecting surface mounting portion 45, and the frame-shaped substrate portion 44
In the frame of the frame-shaped substrate part 44,
However, it is supported so that it can be switched between a position where it abuts on the document table 13 and a position where it moves upward from the document table 13.

For this reason, the eccentric cams should be
46 is supported by the shaft portion 46a, and the eccentric cam 46 has a connecting optical system 42.
The locking portion 42a fixed to the above is engaged.

In the position shown in FIG. 1, the eccentric cam 46 is in the inverted state,
The lower surface of the connecting optical system 42 is in contact with the original table 13, and the eccentric cam 46 is raised from the position shown in FIG. It moves upward in the frame of 44 and is switched to a position away from the platen 13.

As the eccentric cam 46 rotates, the lower surface of the connecting optical system 42 can be brought into contact with and separated from the surface of the document table 13 while maintaining a parallel state (FIG. 3). On the side surface of 42a, elongated holes 42b, 42b are formed on both sides of the eccentric cam 46.
b and 42b are projecting pieces 44 formed by bending from the frame-shaped substrate portion 44.
a and 44a are engaged.

With the configuration of FIG. 3, based on the rotation of the eccentric cam 46,
The two elongated holes 42b, 42b provided in the connecting optical system 42 are guided by the projecting pieces 44a, 44a of the frame-shaped substrate portion 44, and the lower surface of the connecting optical system 42 can move up and down while maintaining a horizontal state. it can.

4 to 6 show another embodiment in which the connecting optical system 42 can be moved up and down with respect to the frame-shaped substrate portion 44 of the holding member 43, and particularly the configuration around the eccentric cam 46 will be described.

In this embodiment, as means for vertically moving the connecting optical system 42 located in the frame of the frame-shaped substrate portion 44, an eccentric cam 46 is supported on the shaft portion 46a at the center position on both sides of the frame-shaped substrate portion 44. And always indicated by the arrow (counterclockwise)
And a rotation restricting pin 47a which is provided at a position corresponding to the inverted position of the eccentric cam 46, and is also provided at a position corresponding to the upright position. It is configured to be movable between the rotation restricting pin 47b.

The urging force by the means for urging the eccentric cam 46 in the counterclockwise direction is set to be weaker than the urging force of the plate spring member that accompanies the operation of the detection lever member described later. The eccentric cam 46 has a recess 46b that engages with a locking member described later in the inverted position.

A detection lever member 48 capable of rotating counterclockwise about the shaft portion 48a is supported in the vicinity of the eccentric cam 46 provided on the frame-shaped substrate portion 44, and the detection lever member 48 rotates. Edge 48b
When the frame-shaped substrate portion 44 is pulled up to an upper position apart from the document table 13, it projects from the lower surface of the frame-shaped substrate portion 44, and the counterclockwise rotation of the detection lever member 48 is regulated by the rotation regulating pin 47c. Has been done.

A plate spring member 49 is fixed to one end of the detection lever member 48,
An eccentric cam 46 can be pressed and rotated at the tip of the plate spring member 49, and a claw portion 49a that can engage with the recess 46b formed in the eccentric cam 46 is formed.

In the embodiment of the present invention having the above-described structure, when the reflecting surface unit 4 is pulled up from the document table 13 (state of FIG. 4), the detection lever member 48 moves counterclockwise until it comes into contact with the rotation restricting pin 47c. Because of the rotation, the eccentric cam 46 is rotated counterclockwise by the urging force until it comes into contact with the rotation restricting pin 47b, and the eccentric cam 46 is erected, so that the coupling optical system 42 is moved relative to the frame-shaped substrate portion 44. And pull up to the upper position. From this position, when the reflecting surface unit 4 is placed on the document table 13 (state shown in FIG. 5), the detection lever member 48 is detected by the document table 13.
Rotates clockwise, and the plate spring member 49 rotates the eccentric cam 46 clockwise against the biasing means until it comes into contact with the rotation restricting pin 47a. At the position shown in FIG. cam
46 abuts on the rotation restricting pin 47a and becomes an inverted position, and the eccentric cam 46 is held at the position shown by the engagement of the claw portion 49a of the plate spring member 49 and the concave portion 46b of the eccentric cam 46, and the connecting optical system. 42
Can be lowered to a position where it abuts on the document table 13. At this time, when the transparent original is placed on the original table 13, the connecting optical system 42 is located on the transparent original. Since the lower surface of the connecting optical system 42 always comes into contact with the document table 13, a slight gap C is formed between the upper surface of the eccentric cam 46 in the inverted position and the locking portion 42a of the connecting optical system 42. Is configured.

In order to move the reflecting surface unit 4 from the state where the reflecting surface unit 4 is positioned on the original table 13 (the state shown in FIG. 6), as shown in FIG. Then, the detection lever member 48 separates from the document table 13 and rotates counterclockwise until it comes into contact with the rotation restricting pin 47c, and the plate spring member 49 also rotates counterclockwise and the recess 46b of the eccentric cam 46. Away from the eccentric cam 46, the claw 49a and the recess 46b are disengaged from each other.
Is rotated counterclockwise by its urging force, and as shown in FIG. 4, the connecting optical system 42 is switched to a state in which it is pulled up with respect to the frame-shaped substrate portion 44.

7 and 8, the reflecting surface 41 and the connecting optical system 42 are integrally coupled by a reflecting surface holding member 43A, and the reflecting surface holding members 43A are positioned on both sides of the reflecting surface holding member 43A and slide on the original table 13. It is supported by the unit side plate 50, and the reflection surface holding member 43A is supported by the unit side plate 50 at a position where the connecting optical system 42 abuts on the document table 13 (FIG. 7) and at a position where it is separated from the document table 13 upward. A means for switching to (FIG. 8) is provided.

That is, the eccentric cam 46 is attached to the unit side plate 50 so as to rotate the reflecting surface holding member 43A in the vertical direction so that the eccentric cam 46 can rotate by a predetermined angle.
A pin 51 formed on the reflection surface holding member 43A is provided at an upper position corresponding to.

Further, in order to guidely move the reflection surface holding member 43A with respect to the unit side plate 50, a guide groove 52 is formed in the unit side plate 50 in the vertical direction, and the guide groove 52 is projected to the reflection surface holding member 43A. The two guide pins 53, 53 provided are inserted.

In the configuration of the unit side plate 50 and the reflection surface holding member 43A as described above, as shown in FIG. 8, the eccentric cam 46 is in the upright state, and the connecting optical system 42 is positioned away from the original table 13 and positioned. When the eccentric cam 46 is rotated so that the large-diameter portion of the eccentric cam 46 is turned laterally and the small-diameter portion faces the pin 51, the pin 51 moves together with the guide pins 53, 53. The reflecting surface holding member 43A moves down along the guide groove 52 and the guide groove 52 until the connecting optical system 42 comes into contact with the document table 13 (state of FIG. 7).

Further, when the eccentric cam 46 is rotated counterclockwise in the position shown in FIG. 7 and the pin 51 is pushed up by the large diameter portion of the eccentric cam 46, the guide pins 53, 53 rise through the guide groove 52. The connecting optical system 42 of the reflection surface holding member 43A is set apart from the original table 13 and set in a floating state (state of FIG. 8).

In the embodiment shown in FIGS. 7 and 8, when the reflecting surface and the coupling optical system are integrally coupled by the reflecting surface holding member, the reflecting surface holding member is attached to the unit side plate located on the document table. Although it is configured to be movable in the vertical direction by the eccentric cam, the coupling optical system is supported to be slightly movable up and down with respect to the reflecting surface holding member having the reflecting surface fixed, and the reflecting surface holding member is thus supported by the eccentric cam. It is also possible to attach the unit side plate so as to be movable in the vertical direction.

[Effect of device]

With the configuration of the present invention, the connecting optical system is not inadvertently damaged when the reflecting surface unit is placed on the original plate or a surface other than the original plate, and the reflecting surface unit is lifted from the original plate to prevent the original platen from moving. It has the effect of enabling protection of the coupling optical system by mounting it on the device, and also enables protection of the coupling optical system in a state where the mounting accuracy of the reflecting surface and the coupling optical system during reading is improved. .

[Brief description of drawings]

FIG. 1 is a side view showing a first embodiment of the present invention, FIG. 2 is a side view showing a raised position of a coupling optical system of a reflecting surface unit portion in FIG. 1, and FIG. 3 (a) (b). Is a front view and a side view showing a main part for restricting the vertical movement of the connecting optical system, and FIGS. 4 to 6 show a second embodiment of the present invention. FIG. 7 and FIG. 8 are side views showing a changed state of the operation when separated, and FIGS. 7 and 8 are side views of the changed state of the operation showing the third embodiment of the present invention. 4 ... Reflecting surface unit portion, 41 ... Reflecting surface, 42 ... Coupling optical system, 43 ... Reflecting surface holding member, 44 ... Frame-shaped base frame portion, 46 ...
… Eccentric cam, 48 …… Detecting lever member, 43A …… Reflecting surface holding member, 50 …… Unit side plate.

Claims (3)

[Scope of utility model registration request] 1. A transmissive original document projection apparatus comprising a projection apparatus main body having an illumination optical system and an imaging optical system, and a reflection surface unit section having a reflection surface and a coupling optical system, wherein the reflection surface unit section has: A transparent original projecting device in an original reading device, wherein a connecting optical system is supported by a frame-shaped substrate portion of a reflecting surface holding member by means capable of being vertically displaced. 2. An eccentric cam biased in one direction between the frame-shaped substrate portion and the coupling optical system as a means for vertically displacing the coupling optical system with respect to the frame-shaped substrate portion, and a reflection. 2. The transparent original projecting device in the original reading device according to claim 1, comprising a detection lever member capable of restricting the movement of the eccentric cam by bringing the surface unit portion into contact with and separating from the original table. 3. A transmissive original document projection apparatus comprising a projection apparatus main body having an illumination optical system and an imaging optical system, and a reflection surface unit section having a reflection surface and a coupling optical system, wherein the reflection surface of the reflection surface unit section In a document reading apparatus, a reflection surface is fixedly held by a holding member, a connecting optical system is supported, and the reflection surface holding member is supported so as to be vertically movable with respect to a unit side plate located on a document table. Transparent original projection device.