JP4517919B2 - Head-up display - Google Patents

Description

  The present invention relates to a head-up display including a combiner that allows a user to superimpose images and information on an external scene.

  In general, a head-up display is installed in front of a user's eye and an image display device that is attached to an aircraft or vehicle frame and emits an image or information in front of the user's eye, and an image displayed on the image display device. And an optical system that forms an image in front of the combiner, and displays an image from the image display device in combination with outside scene light.

When such a head-up display is attached to the cockpit of an aircraft, when a heavy impact is applied to the aircraft due to turbulence or the like, the user's head is beaten forward by gravitational acceleration and the combiner There is a risk of crashing the head and damaging the head. Therefore, conventionally, as shown in FIG. 5 of Patent Document 1, for example, when the head hits, the combiner is rotated forward by the force to reduce the impact.
JP 2001-51228 A JP-A-10-138794

  However, in the above-mentioned conventional means, when the combiner is used, it is necessary to hold the combiner stably so that the combiner does not resonate due to vibration of the airframe or bend forward. Because it is set firmly, the reaction when the head hits is large, especially when a large gravitational acceleration is applied, the impact level also increases proportionally, and there is no denying the possibility of damaging the head There was a problem.

  In view of this, the present invention is designed so that when the aircraft body receives a large impact such as sudden braking, the combiner is moved to the avoidance position in front of the user before the user's head is hit forward and collides with the combiner. The main object of the present invention is to provide a head-up display that protects the user's head by avoiding it naturally.

  In order to achieve the above object, the present invention takes the following technical means. That is, according to the present invention, in a head-up display equipped with a combiner, the combiner can be rotated from a use position corresponding to the front of the user to an avoidance position in front of the user with respect to the head-up display housing. A combiner holding means for holding, an elastic member that constantly biases the combiner to the use position, a stopper mechanism that stops the combiner at the use position, an engagement portion that holds the combiner at the avoidance position, and engagement of the engagement portion Release means for releasing the combiner, and when the combiner user is subjected to gravity acceleration such that the head of the combiner is swung toward the combiner, the combiner is in an avoidance position against the elasticity of the elastic member. The elasticity of the elastic member is set in advance so as to naturally rotate toward the surface.

  Since the head-up display according to the present invention is configured as described above, when the vehicle equipped with the head-up display is subjected to a large impact such as sudden braking, the user's head is hit forward. Thus, before the user's head collides with the combiner, the combiner can naturally avoid the avoidance position in front of the user and protect the user's head in advance. Further, since the combiner moved to the avoidance position is held at that position by the engaging portion of the engaging means, it is possible to prevent the head from being beaten by the combiner returned by the reaction, and in addition, the releasing means Thus, by releasing the engagement of the engaging portion, there are various effects that the combiner can be easily returned to the use position.

(Means and effects for solving other problems)
In the above invention, the elastic force of the elastic member naturally rotates toward the avoidance position against the elastic force of the elastic member when the combiner is loaded with a gravitational acceleration of 2 to 3 times the standard gravitational acceleration. It is preferable to set with such strength. This is because when the gravitational acceleration of the above value is suddenly applied to the combiner user in the direction of the combiner, the user's head is generally beaten forward. Note that the value of standard gravity acceleration (G) is defined as 9.80665 m / s ² at the 1901 International General Assembly.

In the above invention, it is preferable that the elastic member is a torsion spring and is mounted on a rotating shaft portion of a combiner.
Accordingly, the torsion spring can be compactly incorporated in the rotating shaft portion of the combiner, and the torsion spring itself is inexpensive, so that the cost can be reduced.

Below, the head-up display concerning this invention is demonstrated based on FIGS. 1-3. FIG. 1 is a side view (including a partial cross section) illustrating a head-up display according to an embodiment of the present invention, and is a view when the combiner is in a use position. FIG. 2 is a view similar to FIG. 1 and shows the combiner in the avoidance position. FIG. 3 is a cross-sectional view of the head-up display of FIG.
In the figure, symbol A is a housing of a head-up display used by being attached to a cockpit of an aircraft, and a combiner B made of a light transmitting material is held via a combiner holding means C.

  In the housing A, although not shown, an image display device for emitting images and information and a virtual image of the image displayed on the image display device are connected in front of a combiner B installed in front of the user's eyes. An optical system for imaging, and image display light from the image display device is projected onto the combiner B via the optical system to form a virtual image of the image in front of the combiner. This technique is conventionally known.

  The combiner holding means C holds the combiner B so as to be rotatable from the use position shown in FIG. 1 where it hangs down in front of the user's eyes with respect to the housing A of the head-up display to the avoidance position located in front of the user in FIG. A pivot shaft 1 supported by the housing A is included, and a pivot shaft 2 integral with the combiner B is held on the pivot shaft 1 so as to be rotatable. Further, the rotating shaft 2 integral with the combiner B is always given elastic force by the elastic member 3 from the avoidance position toward the use position. In this embodiment, a torsion spring is used as the elastic member 3. The elastic force applied to the torsion spring is adjusted to rotate toward the avoidance position when a gravitational acceleration of 2G or more is applied. Note that the threshold value for starting the rotation toward the avoidance position can be adjusted by exchanging the torsion spring, but it is preferable to set it within a range of 2G to 3G.

  The rotating shaft 2 is provided with a stopper mechanism 4 so as not to rotate further toward the user side when the combiner B is in the use position. The stopper mechanism 4 is composed of a protrusion 4a provided on the rotating shaft 2 and a contact surface 4b formed on the housing A, and the combiner B is moved from the use position to the user direction (clockwise in the figure) by the contact of both. Is prevented from rotating. Further, since the elastic force of the elastic member 3 is loaded in the direction of the contact surface 4b, the combiner B is held at the use position by this elastic force.

  The elasticity of the elastic member 3 is such that when the combiner B is loaded with a large gravitational acceleration such that the head of the combiner user is swung toward the combiner B, the rotary shaft 2 and the elastic member 3 are elastic. The strength is set in advance so as to naturally rotate toward the avoidance position against the above. That is, the combiner user's head is beaten toward the combiner B, and at the same time, the combiner B is formed to jump up toward the avoidance position.

  Furthermore, when the combiner B rotates to the avoidance position, an engagement means 5 that holds the combiner B at that position, and a release means 6 that releases the engagement of the engagement means 5 are provided.

  The engaging means 5 includes a plunger 5b elastically biased toward the peripheral surface of the rotating shaft 2 of the combiner by a spring 5a, an engaging claw 5c formed at the tip of the plunger 5b, The engaging recess 5d is formed on the outer peripheral surface of the moving shaft 2 and engages with the engaging claw 5c at the combiner avoiding position.

  The release means 6 includes a release lever 6a for retracting the plunger 5b against the spring 5a. The release lever 6a is attached to the housing A via a support shaft 6b so as to be swingable, and is provided at an intermediate portion. It is connected to the plunger 5b via the connecting pin 6c. Thus, by swinging the release lever 6a against the spring 5a from the engagement position of FIG. 2, the plunger 5b is retracted and the engagement claw 5c is separated from the engagement recess 5d to engage the both. Can be released.

  When an aircraft equipped with a head-up display constructed as described above is subjected to a large impact such as a sudden braking on the aircraft due to turbulence, etc., the user's head is crushed forward. Before the section collides with the combiner B, the combiner B naturally avoids the avoidance position in front of the user and protects the user's head. Since the combiner B that has moved to the avoidance position is held at that position by the engaging claw 5c of the engaging means 6 being pushed by the spring 5a and engaged with the engaging recess 5d, the combiner B returns due to the recoiled reaction. There is no. Further, by operating the release lever 6a to release the engagement between the engagement claw 5c and the engagement recess 5d, the combiner can be easily returned to the use position.

  The present invention is not limited to the above-described embodiment, and can be implemented with appropriate modifications within a range not departing from the gist of the configuration. For example, the engaging means 5 and the releasing means 6 described above are used to engage and hold the combiner B at the position when the combiner B is flipped up to the avoidance position, and return the combiner B to the use position. Any structure may be used as long as it is a mechanism for manually releasing the engagement.

  INDUSTRIAL APPLICABILITY The present invention can be used for all display devices that are mounted on a vehicle such as an aircraft or a vehicle and display images and information superimposed on the outside.

It is a partial cross section side view which shows one Example of the head-up display concerning this invention, Comprising: The use position of a combiner is shown. It is a partial cross section side view similar to FIG. 1, and shows the avoidance position of the combiner. The cross-sectional view of the head-up display.

Explanation of symbols

A Head-up display housing B Combiner C Combiner holding device 1 Pivot 2 Combiner rotating shaft 3 Elastic member 4 Stopper mechanism 5 Engagement means 6 Release means

Claims (3)

  In a head-up display having a combiner, a combiner holding means for holding the combiner with respect to a head-up display housing from a use position corresponding to the front of the user to a avoidance position in front of the user, and a combiner An elastic member that constantly presses from the avoidance position toward the use position, a stopper mechanism that stops the combiner at the use position, an engagement means that holds the combiner at the avoidance position, and a release means that releases the engagement of the engagement means When the gravitational acceleration is applied to the combiner such that the head of the combiner user is swung toward the combiner, the combiner naturally rotates toward the avoidance position against the elasticity of the elastic member. A head-up display in which the elasticity of the elastic member is preset.   The elastic force of the elastic member is such that the combiner naturally rotates toward the avoidance position against the elastic force of the elastic member when the combiner is loaded with a gravitational acceleration of 2 to 3 times the standard gravitational acceleration. The head-up display according to claim 1, wherein the head-up display is set. The head-up display according to claim 1, wherein the elastic member is a torsion spring and is attached to a rotating shaft portion of a combiner.

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