IMAGE DISPLAY DEVICE

• US 20160005231A1
• Filed: 06/30/2015
• Published: 01/07/2016
• Est. Priority Date: 07/01/2014
• Status: Abandoned Application

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: YAMAGA, Hirokazu
• Application Number:
  US14/755,124
• Publication Number:
  US 20160005231A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02B 2027/0178 Eyeglass type eyeglass details G02C
• CPC Class Codes: G02B 27/0176 characterised by mechanical features
• CPC Class Codes: G02B 7/12 Adjusting pupillary distance of binocular pairs
• CPC Class Codes: H04N 13/344 with head-mounted left-right displays
• CPC Class Codes: H04N 13/398 Synchronisation thereof; Control thereof
• CPC Class Codes: H04N 2213/001 Constructional or mechanical details

Abstract

An image display device used while mounted on a head of an observer includes: a left-eye display unit having an optical section adapted to form a virtual image for a left eye of the observer; a right-eye display unit having an optical section adapted to form a virtual image for a right eye of the observer; and an interpupillary adjustment mechanism adapted to adjust a distance between the left-eye display unit and the right-eye display unit, wherein the interpupillary adjustment mechanism includes a first adjustment mechanism capable of simultaneously adjusting a position of the left-eye display unit and a position of the right-eye display unit, and a second adjustment mechanism capable of independently adjusting only either one of the position of the left-eye display unit and the position of the right-eye display unit.

Claims

1. An image display device used while mounted on a head of an observer comprising:

a left-eye display unit having an optical section adapted to form a virtual image for a left eye of the observer;

a right-eye display unit having an optical section adapted to form a virtual image for a right eye of the observer; and

an interpupillary adjustment mechanism adapted to adjust a distance between the left-eye display unit and the right-eye display unit,

wherein the interpupillary adjustment mechanism includes

a first adjustment mechanism capable of simultaneously adjusting a position of the left-eye display unit and a position of the right-eye display unit, and

a second adjustment mechanism capable of independently adjusting only either one of the position of the left-eye display unit and the position of the right-eye display unit.

2. The image display device according to claim 1, wherein

the interpupillary adjustment mechanism includes

a lead screw provided with a first male screw section provided with a screw thread formed in a first screw direction, and a second male screw section provided with a screw thread formed in a second screw direction different from the first screw direction,

a left-eye support section adapted to support the left-eye display unit, and

a right-eye support section adapted to support the right-eye display unit,

either one of the left-eye support section and the right-eye support section is provided with a female screw to be screwed with the first male screw, and

the other of the left-eye support section and the right-eye support section is provided with a screw coupling section, which has an inner peripheral surface provided with a female screw to be screwed with the second male screw, and is rotatable with respect to the other of the left-eye support section and the right-eye support section.

3. The image display device according to claim 2, further comprising:

a rotation restriction section adapted to restrict a rotation of the screw coupling section when rotating the lead screw, and not to restrict a rotation of the screw coupling section when rotating the screw coupling section.

4. The image display device according to claim 3, wherein

the rotation restriction section has a projection section provided to the other of the left-eye support section and the right-eye support section, and having pressure contact with the screw coupling section.

5. The image display device according to claim 4, wherein

the screw coupling section has a recessed section to which the projection section is inserted.

6. The image display device according to claim 2, further comprising:

a clutch adapted to switch between a rotation-restricted state in which a relative rotation between the screw coupling section and the other of the left-eye support section and the right-eye support section is restricted, and a rotation-allowed state in which the relative rotation between the screw coupling section and the other of the left-eye support section and the right-eye support section is allowed.

7. The image display device according to claim 6, wherein

the clutch is fitted into a space formed between an outer peripheral surface of the screw coupling section and the other of the left-eye support section and the right-eye support section in the rotation-restricted state, and

the fit of the clutch into the space is released in the rotation-allowed state.

8. The image display device according to claim 7, wherein

the outer peripheral surface of the screw coupling section is tilted with respect to an axial direction of the lead screw.

9. The image display device according to claim 8, wherein

the clutch has a cylindrical section having a cylindrical shape, and

an inner peripheral surface of the cylindrical section is tilted with respect to the axial direction of the lead screw.