Head-mountable apparatus

1. A head-mountable apparatus, having a structure forming a cavity between the head of an observer and the head-mountable apparatus when the observer wears the head-mountable apparatus, comprising:

a first pressing member that moves into the cavity, to apply pressure to a first portion of the head;

a second pressing member that moves into the cavity, to apply pressure to a second portion of the head different from the first portion of the head; and

a single adjustment unit that adjusts the pressure applied by both the first and second pressing members,

wherein the single adjustment unit comprises:

a rotatable operation member that generates a rotational force; and

a conversion unit that converts the rotational force generated on rotation of the rotatable operation member into a linear force in a horizontal direction along an axis of the rotation of the rotatable operation member,

wherein the first pressing member is moved into the cavity in a pressing direction orthogonal to the head by the rotational force, and the second pressing member is moved into the cavity in a pressing direction orthogonal to the head by the linear force,

wherein the operation member comprises a first rotation member, a second rotation member, a first generation unit adapted to generate a rotational force upon rotation of the first rotation member, and a second generation unit adapted to generate a linear force upon rotation of the second rotation member, the first pressing member moves in a pressing direction by the rotational force, and presses the first portion, and the second pressing member moves in a pressing direction by the linear force, and presses the second portion.

2. The apparatus according to claim 1 , wherein the first pressing member is connected to the adjustment unit by an elongate member and wherein the elongate member retracts on rotation of the operation member.

3. The apparatus according to claim 2 , wherein the elongate member is wound around a winding member on rotation of the operation member.

4. The apparatus according to claim 1 , wherein the conversion unit comprises a screw thread.

5. The apparatus according to claim 1 , wherein when a predetermined reaction is generated against the linear force, the conversion unit skips the conversion from the rotational force into the linear force by inserting a lock switch locking the conversion into the conversion unit.

6. The apparatus according to claim 1 , further comprising a switching unit that switches an operation of the first generation unit and an operation of the second generation unit upon operation of the operation member by moving a transmission member between the first generation unit and the second generation unit.

7. The apparatus according to claim 1 ,

wherein the operation member is rotatable in a first position and a second position,

wherein when the operation member is rotated in the first position, the first pressing member is moved into the cavity in a pressing direction by the rotational force of the rotation member, and

wherein when the operation member is rotated in the second position, the conversion unit is converts the rotation force to linear force and the second pressing member is moved into the cavity in a pressing direction by the linear force.

8. The apparatus according to claim 1 , further comprising a holding unit that holds a position of the first pressing member at a position, where the head is pressed in use, by applying a pressing force of not less than a predetermined pressing force,

wherein holding by the holding unit is released when the predetermined pressing force is released.

9. The apparatus according to claim 1 , further comprising a third pressing member that moves into the cavity, to apply pressure to a third portion of the head when in use, wherein the adjustment unit adjusts the pressure applied by the third pressing member, to the head when in use, by moving the third pressing member into the cavity in a direction orthogonal to the head.

10. A head-mountable apparatus, having a structure forming a cavity between the head of an observer and the head-mountable apparatus when the observer wears the head-mountable apparatus, comprising:

a first pressing member that moves into the cavity, to apply pressure to a first portion of the head;

a second pressing member that moves into the cavity, to apply pressure to a second portion of the head different from the first portion of the head; and

a single adjustment unit that adjusts the pressure applied by both the first and second pressing members,

wherein the single adjustment unit comprises:

a rotatable operation member that generates a rotational force; and

a conversion unit that converts the rotational force generated on rotation of the rotatable operation member into a linear force in a horizontal direction along an axis of the rotation of the rotatable operation member,

wherein the first pressing member is moved into the cavity in a pressing direction by the rotational force, and the second pressing member is moved into the cavity in a pressing direction by the linear force,

wherein the adjustment unit is arranged on a temporal area of the observer's head when the observer's head is inserted in use,

wherein the operation member comprises a first rotation member, a second rotation member, a first generation unit adapted to generate a rotational force upon rotation of the first rotation member, and a second generation unit adapted to generate a linear force upon rotation of the second rotation member, the first pressing member moves in a pressing direction by the rotational force, and presses the first portion, and the second pressing member moves in a pressing direction by the linear force, and presses the second portion.

11. The apparatus according to claim 10 , wherein the first pressing member is connected to the adjustment unit by an elongate member and wherein the elongate member retracts on rotation of the operation member.

12. The apparatus according to claim 11 , wherein the elongate member is wound around a winding member on rotation of the operation member.

13. The apparatus according to claim 10 , wherein the conversion unit comprises a screw thread.

14. The apparatus according to claim 10 , wherein when a predetermined reaction is generated against the linear force, the conversion unit skips the conversion from the rotational force into the linear force by inserting a lock switch locking the conversion into the conversion unit.

15. The apparatus according to claim 10 , further comprising a switching unit that switches an operation of the first generation unit and an operation of the second generation unit upon operation of the operation member by inserting a lock switch locking the conversion into the conversion unit.

16. The apparatus according to claim 10 ,

wherein the operation member is rotatable in a first position and a second position,

wherein when the operation member is rotated in the first position, the first pressing member is moved into the cavity in a pressing direction by the rotational force of the rotation member, and

wherein when the operation member is rotated in the second position, the conversion unit converts the rotation force to linear force and the second pressing member is moved into the cavity in a pressing direction by the linear force.

17. The apparatus according to claim 10 , further comprising a holding unit that holds a position of the first pressing member at a position, where the head is pressed in use, by applying a pressing force of not less than a predetermined pressing force,

wherein holding by the holding unit is released when the predetermined pressing force is released.

18. The apparatus according to claim 10 , further comprising a third pressing member that moves into the cavity, to apply pressure to a third portion of the head when in use, wherein the adjustment unit adjusts the pressure applied by the third pressing member, to the head when in use, by moving the third pressing member into the cavity in a direction orthogonal to the head.