JPH0425700Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is used in copying machines such as electrophotographic copying machines, facsimile machines, OCR (character reading devices), etc., by illuminating the original in a band shape. The present invention relates to an optical device for forming an optical image on a document for forming an image.

[Technology background]

For example, a copying apparatus such as an electrophotographic copying machine requires an optical device for forming an optical image of the original by illuminating the original to be copied and forming a light image of the original onto a photoreceptor.

FIG. 4 shows an example of an optical device for forming an optical image of an original when applied to an electrophotographic copying machine, in which a bar-shaped original illumination lamp 1 and a gutter-shaped reflector 3 are used to cover the width of a transparent glass original platen 5. A refractive index gradient lens array 4 is inserted, which forms an elongated strip-shaped illumination area 51 extending in the direction, and has an elongated light-receiving surface that forms an optical path for projecting light reflected from the original onto the photoreceptor 6 from the illumination area 51. It is configured. By moving and scanning the original platen 5 relative to the original optical image forming optical device in its length direction, an optical image of the entire area of the copied original is projected onto the photoreceptor 6.

Recently, however, electrophotographic copying machines are becoming more and more compact, and from this point of view, there is a need to reduce the installation space of the optical device for forming an original optical image. For this reason, reflecting mirror 3,
A holder 7 is used that commonly holds the lamp 1, the gradient index lens array 4, and the like. This holder 7 includes an elongated substrate 71 extending in the same direction as the lamp 1 and fixed to a mounting part (not shown) of the device.
and a pair of standing side plates 72 fixed to one end and the other end of this substrate 71. The side plates 72, 72 include connecting plate portions 81, 81 extending obliquely along the optical path toward the document table 5;
Narrow portions 82, 8 are provided at the ends of the connecting plate portions 81, 81.
2 are provided through the lens array 4.

According to the optical device for forming a document optical image having such a configuration, the side plates 72, 72 are connected to the connecting plate portions 81, 8.
1 extends along the optical path toward the document table 5,
Tip holding parts 83 and 8 that hold the gradient index lens array 4 at the tips thereof via narrow width parts 82 and 82
3 is formed, the tip holding parts 83, 83
A space 84 is formed adjacent to the space 84, and therefore this space 84 can be used for example, the charger 2 of the electrophotographic copying machine.
It can be used as a space to place
As a result, it is possible to obtain an optical device for forming an optical image of an original which is thin and compact and requires a small installation space in an electrophotographic copying machine.

[Problem that the invention attempts to solve]

However, as a result of forming the side plates 72, 72 in the above shape to form the space 84, a large force is applied to the narrow parts 82, 82 due to the weight of the gradient index lens array 4 held by the tip holding parts 83, 83. Therefore, the narrow portions 82, 82 are easily deformed, and the narrow portions 82, 82 are easily deformed during installation work.
When a downward external force is applied to the upper part of 2, 82, the narrow part 82, 82 is easily deformed,
As a result, there is a problem in that it is difficult to reliably hold the gradient index lens array 4 at an appropriate position.

[Purpose of invention]

The present invention was developed based on the above-mentioned circumstances, and its purpose is to be able to securely hold a gradient index lens array without positional displacement while having a thin and compact configuration. An object of the present invention is to provide an optical device for forming an optical image on a document.

[Means for solving problems]

The optical device for forming an optical image on a document according to the present invention includes a rod-shaped document illumination lamp and a gutter-shaped reflector that irradiate light onto the document table from an oblique direction in order to form a strip-shaped illumination area on the document table, and a gutter-shaped reflecting mirror. a gradient index lens array for projecting light from A board fixed to the mounting part and extending in the same direction as the lamp, a connecting plate part standing up from both ends of this board and extending obliquely along the optical path toward the document table, and a narrow part at the tip of the connecting plate part. and a pair of side plates comprising a tip holding part for holding the gradient index lens array, each of the pair of side plates having a reinforcing plate part formed in the narrow part. It is characterized by being

[Effect]

According to this configuration, the pair of side plates includes a connecting plate portion that stands up from both ends of the substrate and extends diagonally along the optical path toward the document table, and a narrow portion provided at the tip of the connecting plate portion. It consists of a tip holding part that holds the gradient index lens array, and a reinforcing plate part is formed in the narrow part, so the bending strength in the narrow part is significantly increased, and therefore the side plate is Deformation is prevented, and as a result, a space is formed in the area adjacent to the tip holding part, resulting in a thin and compact configuration, while reliably holding the gradient index lens array in an appropriate posture without causing any positional displacement. be able to.

〔Example〕

The present invention will be described in detail below with reference to the drawings.

FIGS. 1 and 2 are explanatory diagrams showing an embodiment in which the optical device for forming an optical image of a document according to the present invention is applied to an electrophotographic copying machine. 1 is a rod-shaped document illumination lamp, 3 is a gutter-shaped reflecting mirror, 4 is a gradient index lens array, 5 is a transparent glass document table, 6 is a rotating drum-shaped photoreceptor, and 7 is a holder. .

In this example, there is a bar-shaped document illumination lamp 1 extending in the width direction of the document table 5 (perpendicular to the paper surface in FIG. 2) at a position below the document table 5, and a gutter-shaped lamp 1 surrounding this lamp 1 and extending in the same direction. Reflector 3
As a result, the document table 5 is irradiated with light from diagonally downward, so that a belt-shaped illumination area 51 extending in a direction perpendicular to the plane of the paper in FIG. 2 is formed on the document table 5.

The holder 7 is fixed to a mounting portion (not shown) of an electrophotographic copying machine. an elongated substrate 71 extending below the lamp 1 in the same direction as the lamp 1;
Connection plate portions 8 stand up from both ends of this substrate 71 and extend obliquely along the optical path toward the document table 5.
1, 81 and distal end holding parts 83, 83 for holding the gradient index lens array 4, which are provided at the distal ends of the connecting plate parts 81, 81 via narrow width parts 82, 82.
The reinforcing plate portions 85, 85 are formed in the narrow portions 82, 82. A lamp holder 10 that holds the lamp 1 is fixed to the substrate 71, and a reflecting mirror 3 is fixed between the connecting plate parts 81, 81 of the side plates 72, 72.

The reinforcing plate portions 85, 85 in the illustrated example are elongated, projecting inside the narrow width portions 82, 82, respectively, and extending in the width direction of the gradient index lens array 4 (left-right direction in FIGS. 1 and 2). It has a plate-like form. Specifically, for example, the narrow portions 82, 8
The side plates 72, 72 may be integrally formed with elongated protrusions extending along the upper edges of the side plates 2, and the protrusions may be bent toward the opposing surfaces of the side plates 72, 72.

The connecting plate parts 81, 81 of the side plates 72, 72 extend from the concave side of the reflecting mirror 3 toward the light exit port thereof, following the outline of the side part of the reflecting mirror 3,
A space 84 is formed between the lower edge of the lens array 81 and the tip holders 83, 83 of the gradient index lens array 4, and a charger 2, for example, of an electrophotographic copying machine is disposed in this space 84. Ru.

a tip holding section 83 that holds the gradient index lens array 4 provided at the tips of the side plates 72, 72;
83 has, for example, a cut-and-raised piece formed by cutting and raising a part of the side plates 72, 72 in a direction opposite to the side where the side plates 72, 72 face, and the cut-and-raised piece and an appropriate holding plate , a gradient index lens array 4 is solid-stated so that its light-receiving surface extends opposite the illumination area 51 on the document table 5 .
This gradient index lens array 4 has an illumination area 5.
This is an imaging lens for forming an image of the light reflected from the document 1 onto the photoreceptor 6, and is formed by, for example, a large number of optical fibers arranged closely in parallel and integrated into an elongated plate shape using a molding material. .

As shown in FIG. 3, the document illumination lamp 1 includes a long rod-shaped tube-shaped enclosure 11 made of quartz glass.
Inside, there is a coil-shaped light emitting part 1 made of tungsten.
This halogen incandescent lamp is constructed by disposing filaments 14 in which filaments 2 and linear non-light emitting parts 13 are arranged alternately so as to extend along a tube axis 15. Reference numerals 16 and 17 denote internal leads, and one end of each of these internal leads 16 and 17 is connected to both ends of the filament 14, and the other end is connected to the inner end side of metal foils 18 and 19, which will be described later. 1
Reference numerals 8 and 19 denote metal foils made of, for example, molybdenum that are sealed within the flat end sealing portions, and the inside of the tubular sealing body 11 is hermetically sealed with these metal foils 18 and 19. Reference numerals 20 and 21 denote external lead rods, and one end of each of these external lead rods 20 and 21 is connected to the metal foils 18 and 19, and the other end extends outwardly from the end sealing parts 22 and 23. There is. 24 is a supporter, 25 and 26 are cylindrical bases fixed to the end sealing parts 22 and 24, respectively, and 27 and 28 are external lead rods 20 held by adhesive inside the cylinders of the bases 25 and 26, respectively. ，
This is a contact electrically connected to 21.

According to the above embodiment, the pair of side plates 72, 72 constituting the holder 7 stand up from both ends of the substrate 71 extending in the same direction as the document illumination lamp 1, and extend diagonally along the optical path toward the document table 5. Connecting plate portion 8 extending to
1, 81, and tip holding parts 83, 83 for holding the gradient index lens array 4, which are provided at the tips of the connecting plate parts 81, 81 via narrow parts 82, 82, and the narrow part 82, 82 has a reinforcing plate part 85,
85 is formed, the narrow portions 85, 8
5, the bending strength is significantly increased,
Therefore, deformation of the side plates 72, 72 is prevented, and as a result, a space 84 is formed in the area adjacent to the tip holding parts 83, 83, resulting in a thin and compact structure, while the gradient index lens array 4 is prevented from being displaced. It is possible to reliably hold the object in an appropriate posture without any discomfort.

Therefore, the space 84 can be used to arrange, for example, the charger 2 of the electrophotographic copying machine, and as a result, it is possible to greatly contribute to miniaturization of the electrophotographic copying machine.

In this example, the reinforcing plate portions 85, 8
5 extends in the length direction of the narrow parts 82, 82, the narrow parts 82, 82 have a large strength against deformation such as bending in the length direction, and the side plates 72, 72 deformation can be reliably prevented.

Although the present invention has been described above based on one embodiment, the present invention is not limited to the above embodiment and can be modified in various ways.

For example, the reinforcing plate portion may be provided by fixing a separate member to the narrow portion using appropriate fixing means.

Further, the specific configuration of the tip holding section that holds the gradient index lens array is not particularly limited, and various configurations can be adopted.

The optical device for forming an optical image of a document according to the present invention can be used not only in copying machines but also in facsimiles, OCR (character reading devices), and the like.

[Effect of idea]

As described above, according to the optical device for forming a document optical image of the present invention, the pair of side plates constituting the holder stand up from both ends of the substrate extending in the same direction as the document illumination lamp, and are arranged in the optical path toward the document table. It consists of a connecting plate that extends obliquely along the line, and a tip holding part that holds the gradient index lens array, which is provided at the tip of this connecting plate through a narrow part, and a reinforcing plate part is provided at the narrow part. As a result, the bending strength is significantly increased in the narrow part, thereby preventing deformation of the side plate.As a result, a space is formed in the area adjacent to the tip holding part, making it thin and compact. With this configuration, the gradient index lens array can be reliably held in an appropriate posture without any displacement of its position.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are an explanatory plan view and an explanatory front view, respectively, showing an embodiment of the optical device for forming a document optical image of the present invention applied to a copying machine;
FIG. 3 is an explanatory sectional view showing an example of a lamp for illuminating an original, and FIG. 4 is an explanatory view showing an example of an optical device for forming an optical image of an original. 1...Lamp for document illumination, 3...Reflector, 4...
...Gradient index lens array, 5...Original table, 5
1... Illumination area, 6... Photoreceptor, 7... Holder,
71... Board, 72, 72... Side plate, 81, 81
...Connection plate part, 82, 82...Narrow width part, 83, 8
3...Tip holding part, 84...Space, 85,8
5... Reinforcing plate part, 10... Lamp holder, 11
. . . Tube-shaped enclosure, 12 . . . Light emitting portion, 13 .

Claims (1)

[Claims for Utility Model Registration] A rod-shaped document illumination lamp and a gutter-shaped reflector that irradiate light from an oblique direction onto the document table in order to form a belt-shaped illumination area on the document table, and a gutter-shaped reflector that emits light from the illumination area. A gradient index lens array for projecting images, and a holder that commonly holds the original illumination lamp, a gutter-shaped reflecting mirror, and the gradient index lens array, and the holder is fixed to a mounting part of the device. be done,
A substrate extending in the same direction as the lamp, a connecting plate portion standing up from both ends of the substrate and extending obliquely along the optical path toward the document table, and a narrow portion provided at the tip of the connecting plate portion. and a pair of side plates comprising a tip holding part for holding a gradient index lens array, each of the pair of side plates having a reinforcing plate part formed in the narrow part. An optical device for forming an optical image of a document.