JPH0618259Y2 - Colorimeter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a colorimeter for measuring the color of an object to be measured.

[Conventional technology]

As a type of colorimeter, the light from the light source is projected onto the measurement site of the object to be measured (hereinafter referred to as "object"), the light diffusely reflected by the object is received by the light receiving sensor, and the colorimetric data is measured by the micro computer. There is a colorimeter in which arithmetic processing is performed to obtain the tristimulus values X, Y and Z of the CIE colorimeter.

In such a colorimeter, a measuring table having an opening is provided in a part of a housing containing a light projecting section and a light receiving section, and an object to be measured is placed on the measuring table to measure the color of the object. It is becoming like this.

[Problems to be solved by the device]

However, in such a conventional colorimeter, the opening of the measuring table is covered with a detachable cap, but if you forget to do this or lose it, there will be a lot of dust on the factory floor. In such a case, there is a possibility that dust may intrude into the housing from the opening at any time and adhere to the light projecting lens and the light receiving sensor inside.

For objects such as paper and cloth that are fibrous or matte coated objects that easily generate powder, there is a risk that the fibers or powder will fall just by placing the object on the measuring table. There is also a case where the light passes through the opening and falls into the internal optical system.

In such a case, the amount of projected light and the amount of received light decrease according to the degree of adhesion of dust, fibers, powder or liquid (hereinafter referred to as "dust etc."), and depending on the type of dust etc. However, there is a problem that accurate measurement cannot be performed due to the reflection and absorption of the light.

Therefore, there is a system in which the opening of the measurement table is covered with a colorless and transparent glass plate, but there is a problem that a measurement error occurs even in this case because the glass plate itself has an absorption wavelength range. It was

It is an object of the present invention to solve such a conventional problem and provide a colorimeter capable of preventing dust and the like from adhering to a light projecting lens and a light receiving sensor and erroneous measurement due to the dust and the like.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention provides a measuring table having an opening in a part of a housing accommodating a light projecting section and a light receiving section, and mounts an object to be measured on the measuring table. Then, in the colorimeter that projects the light from the light projecting portion to the object to be measured through the opening, and receives the light diffusely reflected by the object to be measured by the light receiving sensor to measure the color. At the bottom, a shutter member that opens and closes the opening of the measuring table by sliding in the horizontal direction, a dust storage box fixed to one end of the shutter member, and the shutter member are provided. A drive means for reciprocating in the horizontal direction together with the receiving box, and a base end fixed to a fixed portion and a free end slidingly contacting the surface of the shutter member to wipe off dust adhering to the surface and drop into the receiving box. Provided is a colorimeter provided with a wiping member.

In the colorimeter, the first detecting means for detecting the closed state of the shutter member, the second detecting means for detecting the open state, the signals from the first and second detecting means, and It is preferable to provide a control means for controlling the driving means by a signal from a measurement button provided on the housing for giving a measurement start command.

[Action]

With the above configuration, the opening of the measuring table can be closed with a shutter member at all times, and even if you forget to leave the cap on many dust spots such as the factory floor or leave it unattended during measurement preparation. Even if dust or the like falls, there is no possibility that dust or the like will enter the optical system inside the housing.

When the shutter member is opened prior to the color measurement, dust and the like adhering to the surface of the shutter member is wiped by the wiping member as the shutter member moves, so that the light projecting portion and the light receiving portion can always be kept clean.

In addition, since the shutter member is provided with a receiving box for storing the wiped dust, etc., the dust, etc. will fall into the inside of the housing, and it will be scattered by the movement of the air to the light projecting system and the light receiving system. There is no risk of adhesion.

Further, if the shutter member is automatically opened by a measurement start command and automatically closed after the color measurement is completed, the operability of the colorimeter can be greatly improved.

〔Example〕

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

FIG. 5 is a perspective view showing an external appearance of an automatic colorimeter with a built-in micro computer to which the present invention is applied, and a ring-shaped measuring table 2 having an opening 2a on the right side of the top view of the housing 1.
The light source chambers 3 are provided inside the left side, and the operation panel 4 on the front side is provided with a measurement button 5 for giving a measurement start command.

FIG. 6 shows an example of an optical system housed inside the housing 1. The light projecting unit includes a light source 10 and an aspherical lens 1.
1, spherical biconvex lenses 12, 13 and heat ray absorbing filter 1
It is composed of a collimator 15 composed of four, a reflecting mirror 18 and a light projecting lens 19.

The reflecting mirror 18 is provided inside the cylindrical base 20 obliquely with respect to the collimator optical axis 1 by 45 degrees, and has an aperture 20a centered on the optical axis 1 on the collimator 15 side.

On the upper part of the base 20, a conical pedestal 21 having an apex angle of 90 degrees is fixed with its apex side downward, and its axis l ′ intersects with the collimator optical axis l on the reflecting mirror 18. Pedestal 2
A lens holder 22 is provided on the upper surface of which a measuring table 2 having an opening 2a is provided, and on the lower surface of which a projecting lens 19 is exchangeably held.
Is provided so that the axis of the opening 2a and the lens holder 22 coincides with the axis of the pedestal 21 '.

Further, a plurality of light receiving sensors 23 made of photodiodes are provided on the inner surface of the cone of the pedestal 21.

Further, as shown in detail in FIGS. 1 to 3, a shutter case 24 is integrally provided on the lower portion of the measuring table 2, and the shutter case 24 is formed into a flat box shape with the lower portion opened. As shown in FIG. 5, the slit 24a and the cutout portion 24b communicating with the slit 24a are provided on the right side surface, and the bent portion 25a of the motor board 25 is fixedly provided on the right side surface.

On the other hand, a rectangular shutter member 26 through which the slit 24a of the shutter case 24 can be inserted is provided, a notch portion 26a is formed at the left end portion of the shutter member 26, and a receiving box 26b is integrally provided under the notch portion 26a, and a middle portion of the back surface is provided. An angle piece 26c having an L-shaped cross section is fixed, and a receiving box 26b and the angle piece 2 are provided.
Collars 27 are fixed near both ends of 6c, and the right end of the shutter member 26 is inserted from the inside of the shutter case 24 into the slit 24a.

On the left and right sides of the shutter case 24, the guide shaft 2
Two through holes 24c through which 8 and 28 can be inserted are provided, and when the guide shafts are mounted, the pair of guide shafts 28 are parallel to the longitudinal direction of the shutter case 24, and the interval between them is provided in the shutter member 26. The distance between the collars 27 should be equal.

Therefore, with the shutter member 26 inserted in the slit 24a, the pair of guide shafts 28 are inserted rightward through the through holes 24c on the left side surface of the shutter case 24, and then inserted into the collars 27 of the shutter member 26 respectively. , Through the through hole 24c on the right side surface, and the E-rings 29 are attached to both ends of the guide shaft 28, respectively.
When the axial movement of the shutter case 26 is prevented, the shutter member 26 is freely guided by the guide shaft 28.
4 can slide in and out.

In this state, when one end of the rack 30 is fixedly mounted on the central rear surface in the width direction of the shutter member 26, the rack 30 projects rightward through the cutout portion 24b of the shutter case 24 and the cutout portion 25b provided in the motor board 25. .

A motor 31 capable of rotating in both forward and reverse directions is fixed to the lower surface of the motor board 25, and a pinion 32 is fixed to its rotation shaft 31a. The pinion 32 is meshed with the rack 30 to drive the shutter member 26. Together with the rack 30
Sensor plate 33 having a bent portion 33a at one end at the tip of the
Secure the base of the.

Then, a first photo interrupter 34, which is a first detecting means having a light emitting portion and a light receiving portion that face each other across the bent portion 33a of the sensor plate 33, is provided on the motor substrate 25, and the shutter member 26 is left. When in the closed position at the end of the line, the bent portion 33a blocks the optical path of the photo interrupter 34,
When the shutter member 26 moves to the right and starts to open even a little, the respective positions are set so as to retract to the outside of the optical path so that the fully closed position of the shutter member 26 can be detected.

Further, a second photointerrupter 35, which is a second detecting means capable of blocking the optical path only when the shutter member 26 is at the fully opened rightward end, is provided on the motor substrate 25 so that the shutter member 26 can be fully opened. Make it detectable.

Further, an angle plate 36 having an L-shaped cross section is fixedly mounted on the upper surface of the shutter case 24, and a bent piece 36a thereof is attached to the slit 24.
It is inserted through d into the inside of the shutter case, and the base of a strip-shaped or hot-shelves wiping member 37 made of a brush or flexible rubber or a thin piece of plastic is planted at the tip of the shroud member 26. At the time of rightward movement, dust or the like attached to the upper surface of the shutter member 26 is wiped off, and the dust or the like wiped off falls from the notch 26a of the shutter member 26 into the receiving box 26b.

When an object is placed on the measuring table 2 and the measurement button 5 is pressed,
The control unit of the control means (not shown) first opens the shutter member 26 to start color measurement, and after the measurement is completed, the motor 3
1 is rotated in the opposite direction to control each part so that the shutter member 26 is returned to the closed position.

Next, the operation of the embodiment having the above configuration will be described.

When the measurement surface 40a of the object 40 to be measured is placed on the measurement table 2 with the measurement surface 40a facing downward and the measurement button 5 is pressed, the light source 10 is turned on, and at the same time a measurement start signal is issued from the control unit to energize the motor 31. Then, the pinion 32 fixed to the rotating shaft 31a is rotated clockwise in FIG.

As a result, the shutter member 26 is guided by the guide shutter 28 via the rack 30 to the right and the opening 2a of the measuring table 2 is opened.

At this time, as shown in FIG. 3, dust 41 or the like adhering to the upper surface of the shutter member 26 is wiped by the wiping member 37, falls from the notch 26a into the receiving box 26b, and as shown in FIG. Since it is housed in the light emitting lens 19, there is no possibility that it will adhere to the light projecting lens 19 or the light receiving sensor 21.

Dust and the like contained in the receiving box 26b are removed by a suction cleaner or the like when the colorimeter is stopped.

Further, if adhesive paper or the like is laid on the inner surface of the receiving box 26b, the wiped dust or the like is attached to the adhesive surface, and the adhesive paper is regularly replaced, the dust or the like that falls into the receiving box is prevented. It is possible to prevent the shutter member from scattering in four rounds due to the movement of the shutter member.

When the opening 2a is fully opened by the rightward movement of the shutter member 26, the shutter member 26 blocks the light of the second photo interrupter 35, and the signal is transmitted to the control unit to stop the rotation of the motor 31.

When the shutter member 26 stops at the fully open position, the light from the light source 10 which is collimated by the collimator 15 is reflected by the reflecting mirror 18.
Is reflected upward by and is condensed by the light projecting lens 19 on the measurement surface 40a of the object 40.

The light is condensed on the measurement surface 40a, the light is diffusely reflected on the measurement surface 40a, and a part of the light reaches the plurality of light receiving sensors 23, and the output data thereof is input to the microcomputer and processed.
The tristimulus values X, Y, and Z of the measurement surface 40a can be obtained, but since these measurements are not directly related to the gist of the present application, description thereof will be omitted.

When the color measurement is completed, the motor 31 is energized again by the signal from the control unit, the rotary shaft 31a and the pinion 32 fixed thereto are rotated counterclockwise, and the shutter member 26 is moved through the rack 30. Go left and close the opening 2a.

When the opening 2a is completely closed, the bent portion 33a of the sensor plate 33 projecting from the rack 30 blocks the light of the first photo interrupter 34, and the motor 31 is stopped by the signal from the controller. .

In the above embodiment, the shutter member is automatically opened / closed in association with the operation of the measurement button, but this may be done manually, and the invention has been described in the above embodiment. The present invention is not limited to the colorimeter, and can be applied to a colorimeter, a spectrocolorimeter, a stimulus value direct reading type colorimeter, or any other colorimeter.

[Effect of device]

As described above, in the colorimeter according to the present invention, the shutter member that can open and close the opening of the measuring table is provided in the lower part of the measuring table. There is no risk of sticking to the light receiving part or the light receiving part, and accurate color measurement is always possible with a clear optical system.

Further, since the wiping member which is in sliding contact with the surface of the shutter member is provided, it is convenient that dust and the like adhering to the surface of the shutter member are automatically wiped when the shutter member is opened.

Further, since the shutter member is provided with the receiving box for storing the wiped dust or the like, the dust or the like does not drop into the housing.

Further, if the shutter member is automatically opened / closed in association with color measurement, the operability is greatly improved and the risk of erroneous operation can be eliminated.

[Brief description of drawings]

FIG. 1 is a perspective view showing this embodiment, FIG. 2 is an exploded perspective view of the same, FIG. 3 is a longitudinal sectional view showing a closed state of the shutter member, and FIG. 4 is an opened state of the shutter member. FIG. 5 is a longitudinal sectional view showing the same, FIG. 5 is a perspective view showing the appearance of a colorimeter to which the present invention is applied, and FIG. 6 is an optical path diagram showing the configuration of the same optical system. 1 ... Casing, 2 ... Measuring base 2a ... Opening part, 5 ... Measuring button 10 ... Light source, 15 ... Collimator 19 ... Projecting lens, 23 ... Light receiving sensor 24 ... Shatter case, 26 ... ... Shutter member 30 ... Rack, 31 ... Motor 32 ... Pinion, 33 ... Sensor plate 34 ... First photo interrupter 35 ... Second photo interrupter 37 ... Wiping member, 40 ... Object to be measured 41 …… Dust, etc.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Fumio Tendo 1 Juki Co., Ltd., 2-2 Kokuryo-cho, Chofu-shi, Tokyo (72) Creator Waga Gen 70 Ishida Nishi, Masuda-machi, Hiraka-gun, Akita Prefecture (56) References Actually open Sho 63-126839 (JP, U) Actually open Sho 62-149025 (JP, U)

Claims (2)

[Scope of utility model registration request] 1. A measuring table having an opening is provided in a part of a housing accommodating a light projecting section and a light receiving section, and an object to be measured is placed on the measuring table, and the light projecting section is provided. In the colorimeter for projecting light from the section to the object to be measured through the opening, and receiving light diffusedly reflected by the object to be measured by the light receiving sensor, the horizontal direction is provided below the measuring table. A shutter member that is slidable and opens and closes the opening of the measurement table by sliding, a dust-receiving box fixed to one end of the shutter member, and the shutter member together with the receiving box for horizontal movement. A drive means for reciprocating in a direction, and a wiping member having a base fixed to a fixed portion and a free end slidingly contacting the surface of the shutter member to wipe dust adhering to the surface and drop it into the receiving box. A colorimeter characterized by that. 2. The colorimeter according to claim 1, wherein first detecting means for detecting a closed state of the shutter member, second detecting means for detecting an open state, and the first and second A colorimeter provided with a control means for controlling the drive means by a signal from a detection means and a signal from a measurement button provided on the housing to give a measurement start command.