JPH059075U - Optical system of optical reader - Google Patents

Abstract

(57) [Summary] [Structure] A partial cylindrical switching pool is provided at a position facing the image scanner unit, and this switching pool is vertically divided into two parts, a black surface part and a white surface part, to read an image of a medium. When the area is at the image reading position, the white surface portion is switched to illuminate the black surface portion by the light source of the image scanner unit otherwise. [Effect] High-quality image reading can be performed irrespective of the transparency of the medium, and thus a high character recognition rate can be obtained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention relates to an optical system of an optical reading device that reads an image from a recording medium.

[0002]

[Prior art]

  The optical system of a conventional optical reading device that reads an image from a conventional recording medium is To detect the edge of the reference recording medium, buff the surface to make it a mirror surface. It uses a stainless steel plate or a black coated surface.

[0003]

[Problems to be solved by the device]

  As described above, the optical system of the conventional optical reading device uses the buffing of the surface to polish the mirror. Because it uses a stainless steel plate and a surface with black coating, When the transparency of the recording medium becomes high, the background color of the back side can be seen through. However, it has the disadvantage that the recognition rate of characters is lowered.

[0004]

[Means for Solving the Problems]

  The optical system of the optical reader of the present invention is an image sensor for reading an image on a recording medium. And a switching plate arranged on the opposite side of the image sensor with respect to the recording medium. And a light source that irradiates the switching plate with light in an oblique direction. The switching plate is vertically divided into two parts, a black surface part and a white surface part.

[0005]   That is, the optical system of the optical reading device of the present invention reads an image of a recording medium. The image sensor and the recording medium are disposed on the opposite side of the image sensor. Switching plate and light for irradiating light to the switching plate in an oblique direction And a source, and the switching plate is vertically divided into two to form a black surface portion and a white surface portion. The image reading area of the recording medium is at the image reading position by the image sensor. When the white surface is illuminated by the light source, the image reading area of the recording medium When the area other than is at the image reading position by the image sensor, the black surface A switching mechanism is provided for switching the unit so that it is illuminated by the light source. It

[0006]

【Example】

  Next, an embodiment of the present invention will be described with reference to the drawings.

[0007]   1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a side view showing the operation of the embodiment of FIG. 3 and 4 are plan views showing an example of the image read in the embodiment of FIG.

[0008]   In FIG. 1, it has a partially cylindrical shape, and one half surface divided vertically is black. A coating pool that is divided into two parts, black surface 1a and white surface 1b. 1 is connected to the solenoid 3 via the link 2, and the operation of the solenoid 3 The black surface portion 1a and the white surface portion 1b are switched by. Opposed to switching pool 1 The element holder 8 provided in this position receives light from an oblique direction with respect to the medium 9. The two light sources 4 provided at symmetrical positions for irradiation and the portion of the medium 9 irradiated by the light source 4 The rod lens 7 that forms an erecting equal-magnification real image of the image is connected to the rod lens 7. An image sensor 6 for recognizing an upright real image of the image is attached. These form an image scanner unit. Medium 9 is an image scanner It is carried in the direction of arrow A by feed rollers 5a and 5b provided in front of and behind the unit. Sent by the photo sensor 11 provided at the rear of the rear feed roller 5b. Its leading and trailing edges are detected.

[0009]   When the photo sensor 11 detects the leading end of the conveyed medium 9, it outputs a trigger signal. Output. By this signal, the switching pool 1 is, as shown in FIG. The leading edge of the medium 9 is constant from the image reading position 10 by the image scanner unit. Until the black surface portion 1a is illuminated by the light source 4 until it is transported by the distance Can be switched. The image to be read from the front end of the medium 9 is recorded at this fixed distance. It is the distance to the start point of the image reading area being displayed.

[0010]   The starting point of the image reading area of the medium 9 is conveyed to the image reading position 10. Then, as shown in FIG. 2B, the switching pool 1 has the white surface portion 1b as the light source. It is switched to the irradiation position by 4. Subsequently, the medium 9 is transported and When the sensor 11 detects the rear end of the medium 9, the photo sensor 11 outputs a signal again, The switching pool 1 is thus switched from the end of the image reading area of the medium 9 to the end. Until the rear end, the black surface portion 1a is switched to the position illuminated by the light source 4 again. It

[0011]   In this way, the switching process is performed between the image reading area of the medium 9 and the other area. -By switching the irradiation surface of rate 1, high quality images can be obtained regardless of the transparency of the medium. Image reading can be performed, and thus a high character recognition rate can be obtained.

[0012]   As shown in FIG. 3, the image read in the embodiment of FIG. The edge 9a of the medium 9 is detected from the black surface reading area 12 read by the black surface portion 1a of Therefore, the skew angle θ of the medium 9 is calculated using this, and It is possible to correct the transportation direction of No.

[0013]

[Effect of device]

  As described above, the optical system of the optical reading device of the present invention has an image scanner unit. A partial cylindrical switching pool is provided at the position facing the knit. The rate is divided vertically into two parts, the black surface part and the white surface part, and the image reading area of the medium is read. If the area is at the image reading position, the white area is printed, otherwise the black area is printed. The transparency of the medium can be changed by switching the irradiation to the light source of the scanner unit. High-quality image reading can be performed regardless of the It has the effect of being obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a side view showing the operation of the embodiment shown in FIG.

FIG. 3 is a plan view showing an example of an image read in the embodiment of FIG.

[Explanation of symbols]

1 Switching pool 1a Black surface part 1b White surface part 2 links 3 solenoid 4 light sources 5a Feed roller 5b Feed roller 6 image sensor 7 Rod lens 8 element holder 9 medium 9a edge 10 Image reading position 11 Photo sensor 12 Black surface reading area

Claims (2)

[Scope of utility model registration request] 1. An image sensor for reading an image on a recording medium, a switching plate arranged on the opposite side of the image sensor with respect to the recording medium, and a light source for irradiating the switching plate with light from an oblique direction. An optical system of an optical reading device, characterized in that the switching plate is vertically divided into two parts to form a black surface portion and a white surface portion. 2. An image sensor for reading an image on a recording medium, a switching plate arranged on the opposite side of the image sensor with respect to the recording medium, and a light source for irradiating the switching plate with light from an oblique direction. The switching plate is vertically divided into a black surface portion and a white surface portion, and when the image reading area of the recording medium is at an image reading position by the image sensor, the white surface portion is illuminated by the light source to perform the recording. An optical system of an optical reading device, which is provided with a switching mechanism section for switching to irradiate the black surface portion with the light source when an area other than the image reading area of the medium is at an image reading position by the image sensor. .