Electronic unit and case with recessed light-transmission portion

1. An electronic unit comprising:

a circuit board;

a light emitter mounted on one side of the circuit board and configured to emit a light; and

a one-piece resin case accommodating the circuit board on which the light emitter is mounted, wherein

the one-piece resin case includes a first light-transmission portion configured to transmit the light emitted from the light emitter to an outside of the one-piece resin case so as to be bright in desired luminance when viewed from the outside,

the first light-transmission portion includes an outer-surface-side concave portion which is formed by recessing an outer surface of the one-piece resin case so that a thickness of the first light-transmission portion is thinner than a thickness of the one-piece resin case except for the first light-transmission portion, and

the one-piece resin case is formed of a single homogeneous material.

2. The electronic unit according to claim 1 , wherein

the outer-surface-side concave portion is indicative of a position of the first light-transmission portion.

3. The electronic unit according to claim 1 , wherein

a distance between the light emitter and an inner surface of the first light-transmission portion is longer than a distance between a central axis of the one-piece resin case and the inner surface of the first light-transmission portion.

4. The electronic unit according to claim 1 , wherein

the one-piece resin case is resin-molded into a bottomed tubular shape.

5. The electronic unit according to claim 3 , wherein

the one-piece resin case includes a second light-transmission portion which is provided around the first light-transmission portion, and

the second light-transmission portion is configured to transmit light emitted from the light emitter to the outside of the one-piece resin case so as to be bright in a luminance lower than the desired luminance.

6. The electronic unit according to claim 4 , further comprising:

a housing engaged with the one-piece resin case; and

a sealing member which is in close contact with an opening portion of the one-piece resin case and the housing therebetween.

7. The electronic unit according to claim 6 , further comprising:

a rubber holder which is attached to an outer surface of a body of the one-piece resin case and detachable with respect to a bracket as a fixing target.

8. The electronic unit according to claim 7 , wherein

the one-piece resin case includes a stopper portion disposed in the outer surface of the one-piece resin case and configured to position with respect to the holder.

9. The electronic unit according to claim 7 , wherein

the holder includes a holder body, a cover portion which covers an outside of a bottomed portion of the one-piece resin case, and

a through hole exposing the first light-transmission portion to the outside of the cover portion is formed in the cover portion so as to permit an operating state of the electronic unit to be visually recognized.