Color measurement apparatus

1. A color measurement apparatus comprising:

an opening portion forming member that includes an opening, wherein

the opening portion forming member is arranged in a bottom portion of the color measurement apparatus, and

the opening is a region that causes light arriving from a measurement target to enter inside the color measurement apparatus;

a light emitter configured to emit light for measurement toward the measurement target;

an incident light processing portion that includes a photo diode, wherein the photo diode is configured to process light incident through the opening; and

a shutter unit that is configured to switch between a closed state in which the opening is covered, and an open state which is a state when color measurement is performed and in which the opening is open, and that has a reflection reference surface at a position facing the opening in the closed state as a reference of reflectance, wherein

the shutter unit is disposed such that the shutter unit is configured to switch to, in addition to the closed state and the open state by sliding, an exposed state by rotating in which the reflection reference surface is toward outside and is exposed outside the color measurement apparatus,

the shutter unit switches to the open state by sliding in a first direction from the closed state and switches to the closed state by sliding in a second direction opposite to the first direction from the open state,

the shutter unit includes:

a sliding member configured to slide along a bottom surface of the color measurement apparatus, wherein the sliding member is a link that is coupled to the shutter unit,

a shutter that is configured to slide along the bottom surface together with the sliding member, has the reflection reference surface, and is configured to rotate with respect to the sliding member,

a boss that protrudes in a direction intersecting with the first direction and the second direction,

a bottom first frame that constitutes the bottom surface, and

a bottom second frame that is a member constituting the bottom surface together with the bottom first frame and is positioned in the second direction with respect to the bottom first frame,

the bottom second frame is configured to be attached and detached, regulates rotation of the boss in a mounted state, and allows the rotation of the boss by being detached, and

the shutter unit switches to the exposed state by rotation of the shutter with respect to the sliding member.

2. The color measurement apparatus according to claim 1 , wherein the shutter abuts on the bottom surface in the exposed state.

3. The color measurement apparatus according to claim 1 , further comprising:

a first screw that fixes the bottom second frame; and

a second screw that fixes the opening portion forming member,

wherein the second screw is covered with the bottom second frame in the mounted state of the bottom second frame and is exposed by detaching the bottom second frame.

4. The color measurement apparatus according to claim 1 , wherein

in the mounted state of the bottom second frame, the bottom first frame and the bottom second frame constitute a periphery of the bottom surface, and

the bottom first frame and the bottom second frame alternately overlap with each other in coupled parts.

5. The color measurement apparatus according to claim 1 , wherein the shutter unit includes a shutter holding member that includes a first guide shaft, wherein the shutter holding member holds the shutter such that the shutter is configured to be displaced in a direction of approaching to and separating from the opening, and

a spring that presses the shutter toward the opening.

6. The color measurement apparatus according to claim 1 , wherein

the incident light processing portion further includes a variable wavelength optical filter configured to transmit a predetermined wavelength component of incident light, and

the photo diode is further configured to receive light transmitted through the variable wavelength optical filter.

7. The color measurement apparatus according to claim 6 , wherein the variable wavelength optical filter is a Fabry-Perot etalon.