JPH039073Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a hand scanner, that is, an optical character reader (OCR) device that reads characters by sliding the instrument held in the hand over paper on which characters are written. be.

As shown in Figure 1, the hand scanner holds the hand scanner 1 in the hand 3 and the paper 2 on which characters are written.
The characters are optically read by stroking the top and sent as an electrical signal to the identification processing device using the code 4. As shown in FIG. 2, inside this hand scanner, a lamp 5 irradiates light onto a paper 2, and the reflected light is passed through a window 12 and formed into a character image on an image sensor 7 by a lens 6. The signal is converted into an electrical signal, amplified by an amplifier 8, and sent to an identification processing device via a code 4. In conventional hand scanners, the lens is fixed, so that the characters on the paper are imaged onto the image sensor at a predetermined magnification. Since the magnification of the lens is constant, if the text is large, the image will extend beyond the image sensor's light-receiving area and cannot be read, and if the text is small, the line width of the text will exceed the resolution of the image sensor's photoelectric conversion element. If the image is formed too small, it cannot be read. That is, there is a drawback that if the characters are different in size, they cannot be read.

This idea divides the hand scanner into two parts and changes the magnification of the character image formed on the image sensor by simply replacing the tip.
By making the size of the formed character image almost constant even when the size of the characters differs, the above-mentioned drawback is solved by making it possible to read characters of different sizes with the same hand scanner. be.

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

3 and 4 are a perspective view and a sectional view of an embodiment of the present invention. As shown in FIG. 3, the hand scanner is divided into a hand scanner main body 1 and a tip portion 9. In this case, a lens 6 for forming an image of characters on an image sensor is fixed to the tip 9. To attach the tip to the hand scanner body 1, the lever 10 provided on the tip 9 is inserted into the guide 11 of the hand scanner body 1 and fixed with a stopper. In this case, by constructing the lever with an elastic body such as a leaf spring, the tip portion 9 can be easily attached and detached by either strongly pushing it into the hand scanner body 1 or pulling it out.

As shown in FIG. 4, when the tip 9 is attached to the hand scanner body 1, the characters on the paper 2 are imaged onto the image sensor 5 by the lens 6. The lens 6 is fixed at a position determined by the following equation.

1/a+1/b=1/f However, a: Distance from the paper, that is, the surface that contacts the leading edge of the paper, to the center of the lens b: Distance from the center of the lens to the surface of the image sensor f: Focal length of the lens In this case, magnification m is b/a. Therefore, by appropriately selecting a, b, and f, a lens can be selected to provide an arbitrary magnification m, and the lens can be fixed so as to form an image on the surface of the image sensor. In this way, the tip 9 has fixed lenses with different magnifications.
Prepare multiple pieces. In this way, if the size of the characters is different, the characters can be imaged on the image sensor at the desired magnification by simply replacing the tip 9, and the characters can be read completely.

Furthermore, it is convenient to display the numerical value of the magnification 13 on the outer surface of the tip 9 as shown in FIG.

As explained in detail above, the hand scanner of the present invention can read characters and symbols of different sizes by simply replacing the tips of various magnifications prepared in advance, and overcomes the drawbacks of conventional hand scanners. It's a useful thing that I lost.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a conventional hand scanner in use, Fig. 2 is a sectional view thereof, Fig. 3 is a perspective view of the hand scanner of the present invention with the tip removed, and Fig. 4 is a perspective view of the conventional hand scanner in use. It is a sectional view when assembled. 1...hand scanner, 2...paper, 3...hand, 4
... code, 5 ... lamp, 6 ... lens, 7 ... image sensor, 8 ... amplifier, 9 ... tip, 10 ... lever, 11 ... guide, 12 ... window, 13 ... display.

Claims (1)

[Scope of utility model registration request] In a hand scanner, which is an optical reading device that optically reads characters, symbols, etc. written on paper by holding the hand scanner and moving the hand scanner over the characters, symbols, etc. written on paper, the hand scanner is used as an image sensor. It is divided into a hand scanner body with a built-in hand scanner body and a detachable tip part, and when the tip part is attached to the hand scanner body, images of characters, symbols, etc. are formed on the image sensor provided in the hand scanner body. In addition to being equipped with an optical system for imaging, the magnification of the optical system for imaging is clearly indicated on the outside of the tip, and multiple tips having optical systems with different magnifications are prepared in advance to determine the size of characters, symbols, etc. on the paper. A hand scanner that is used by attaching an appropriate tip part to the hand scanner body depending on the situation.