A head-mounted display includes a body, a bearing base, a knob, a guiding element, and a head belt set. The knob is pivoted to the bearing base and located outside the bearing base. The guiding element is pivoted to the bearing base and located inside the bearing base and is configured to be driven by the knob to rotate. The guiding element includes a first gear and a second gear. The head belt set connects the body and the bearing base. The head belt set includes a first side head belt, a second side head belt, and an auxiliary head belt. The first gear is configured to drive the first side head belt and the second side head belt to move. The second gear is configured to drive the auxiliary head belt to move.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority benefit of Taiwan application serial no. 107130732, filed on Aug. 31, 2018. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.

BACKGROUND

Technical Field

The disclosure relates to a display device, and in particular to a head-mounted display.

Description of Related Art

The so-called virtual reality refers to the use of computer simulation to generate a three-dimensional (3D) virtual environment that provides users with sensory simulations such as sight, smell or touch. As a result, the users can acquire a sensation of immersion as if they are present on the scene.

Generally speaking, the user needs to wear a head-mounted display to obtain the image of the 3D virtual environment. The head-mounted display may be roughly divided into two main parts, that is, a body and a head belt set, and the head belt set may be roughly divided into two side head belts passing over the left side and the right side of the user's head and an auxiliary head belt passing over the top of the user's head. By adjusting the lengths of the two side head belts or the auxiliary head belt, the user is able to control the degree of tightness when wearing the head-mounted display. Although the lengths of the two side head belts may be adjusted synchronously through the same adjustment mechanism, the length of the auxiliary head belt needs to be adjusted through another adjustment mechanism. Therefore, in the case where the lengths of the two side head belts and the length of the auxiliary head belt cannot be synchronously adjusted, the user needs to spend more time adjusting the degree of tightness when wearing the head-mounted display.

SUMMARY

The disclosure provides a head-mounted display that is convenient to use.

A head-mounted display of the disclosure includes a body, a bearing base, a knob, a guiding element, and a head belt set. The bearing base is disposed opposite to the body. The knob is pivoted to the bearing base and located outside the bearing base. The guiding element is pivoted to the bearing base and located inside the bearing base and is configured to be driven by the knob to rotate. The guiding element includes a first gear and a second gear configured to stack on the first gear. The head belt set connects the body and the bearing base, and the head belt set includes a first side head belt, a second side head belt, and an auxiliary head belt. The first side head belt has a first gear rack portion extending into the bearing base, and the second side head belt has a second gear rack portion extending into the bearing base; wherein the second gear rack portion is configured to stack on the first gear rack portion, and the first gear is engaged with a first internal gear rack of the firth gear rack portion and a second internal gear rack of the second gear rack portion. The auxiliary head belt has an auxiliary gear rack portion extending into the bearing base, wherein the auxiliary gear rack portion is configured to stack on the second gear rack portion, and the second gear is engaged with an auxiliary internal gear rack of the auxiliary gear rack portion.

Based on the above, the head-mounted display of the disclosure may synchronously control the movements of the first side head belt, the second side head belt and the auxiliary head belt, so that the degree of tightness may be quickly adjusted when the user wears the head-mounted display. In other words, the head-mounted display of the disclosure is convenient to use.

To make the aforementioned and other features and advantages of the disclosure more comprehensible, several embodiments accompanied with drawings are described in detail as follows.

DESCRIPTION OF THE EMBODIMENTS

FIG. 1is a schematic view of a head-mounted display according to an embodiment of the disclosure.FIG. 2is a schematic partial enlarged view showing a location of a knob in the head-mounted display according to an embodiment of the disclosure.FIG. 3is a schematic partial enlarged view showing a bearing base, a first side head belt, and a second side head belt in the head-mounted display according to an embodiment of the disclosure.FIG. 4is a schematic partial enlarged view showing the bearing base, the first side head belt, the second side head belt, and an auxiliary head belt in the head-mounted display according to an embodiment of the disclosure. Particularly, a knob130ofFIG. 2is shown in dashed lines, so as to clearly present the internal structural configuration.FIG. 3andFIG. 4omit illustration of a part of the casing of a bearing base120, so as to clearly present the internal structural configuration.

Referring toFIG. 1andFIG. 2, in the present embodiment, a head-mounted display100includes a body110, a bearing base120, a knob130, a guiding element140, and a head belt set150. The body110is configured to send and receive signals or information, process signals or information, receive power and display images, and the body110is disposed opposite to the bearing base120. Further, when a user wears the head-mounted display100, the body110is closely placed in front of the user's eyes, and the bearing base120is abuts against the back of the user's head. On the other hand, the knob130is pivoted to the bearing base120and located outside the bearing base120. In other words, the knob130and the body110are located at two opposite sides of the bearing base120, respectively. The guiding element140is pivoted to the bearing base120and located inside the bearing base120and is covered by the knob130. Further, the knob130and the guiding element140may be separated from each other or may be abutted against each other due to the rotation of the knob130. When the knob130is rotated to push against the guiding element140, the guiding element140can be rotated synchronously with the knob130.

The bearing base120includes an internal ratchet portion121. Specifically, the knob130is pivoted onto the internal ratchet portion121and includes driving portions131(which are schematically shown as plural). The driving portions131are, for example, bumps that protrude from one side of the knob130facing the bearing base120, and are located inside the internal ratchet portion121. The guiding element140includes a shaft portion141, a positioning portion142, and a stopping portion143. The shaft portion141is pivoted to the internal ratchet portion121and located inside the internal ratchet portion121. The positioning portion142and the stopping portion143are connected to the outer peripheral surface of the shaft portion141. Specifically, the positioning portion142and the stopping portion143are located inside the internal ratchet portion121, and the positioning portion142is configured to engage with a plurality of internal ratchet teeth122of the internal ratchet portion121. On the other hand, the number of the positioning portions142and the number of the stopping portions143may be plural and may be, for example, the same as the number of the driving portions131. Each positioning portion142has an engaging portion142aand a driven portion142bopposite to each other. The driven portions142band the stopping portions143are connected to the outer peripheral surface of the shaft portion141. Also, each stopping portion143is located at one side of the corresponding driven portion142b, or one stopping portion143is disposed between any two adjacent driven portions142b.

As described above, each engaging portion142ais connected to the corresponding driven portion142band extends to one side of the corresponding stopping portion143, and engages at least a part of the internal ratchet teeth122by one side of the engaging portion142afacing away from the shaft portion141. On the other hand, each driving portion131is located between the corresponding engaging portion142aand driven portion142b. In other words, there is a receding space between each engaging portion142aand the corresponding driven portion142bto accommodate the corresponding driving portion131. For instance, the knob130is configured to rotate clockwise or counterclockwise with respect to the bearing base120. When the knob130is rotated clockwise with respect to the bearing base120, each driving portion131rotates with respect to the internal ratchet portion121to push the corresponding driven portion142bto move, so as to drive the guiding element140to rotate synchronously along the same direction. When the knob130stops rotating, structural interference occurs between the engaging portions142aand the internal ratchet teeth122. The structural interference between the engaging portions142aand the internal ratchet teeth122has to be removed before the knob130and the guiding element140can be rotated clockwise or counterclockwise again with respect to the bearing base120depending on the requirements.

When the knob130is rotated counterclockwise with respect to the bearing base120, each driving portion131pushes the corresponding engaging portion142ato move, so as to make the corresponding engaging portion142aelastically deformed toward the shaft portion141, which thereby removes the structural interference with the at least a part of the internal ratchet teeth122. On the other hand, a gap G is maintained between each engaging portion142aand the shaft portion141. Each stopping portion143is located in the corresponding gap G, and each stopping portion143can be used to limit the degree of deformation of the corresponding engaging portion142ato prevent the engaging portions142afrom being overly deformed. Further, the knob130continues to be rotated counterclockwise with respect to the bearing base120. Each driving portion131pushes the corresponding engaging portion142ato move to drive the guiding element140to rotate synchronously along the same direction. When the knob130stops rotating, structural interference occurs between the engaging portions142aand the internal ratchet teeth122. The structural interference between the engaging portions142aand the internal ratchet teeth122has to be removed before the knob130and the guiding element140can be rotated clockwise or counterclockwise again with respect to the bearing base120.

Referring toFIG. 1toFIG. 4, in the present embodiment, the guiding element140further includes a first gear144and a second gear145configured to stack on the first gear144. Specifically, the shaft portion141passes through the bearing base120to connect the first gear144, and the shaft portion141, the first gear144, and the second gear145can rotate synchronously. The head belt set150connects the body110and the bearing base120, and includes a first side head belt151, a second side head belt152, and an auxiliary head belt153. When the user puts on the head-mounted display100, the first side head belt151and the second side head belt152respectively extend by the left and right sides of the user's head, and the auxiliary head belt153extends over the top of the user's head. Through adjusting the lengths of the first side head belt151, the second side head belt152, and the auxiliary head belt153, the degree of tightness of the head-mounted display100when put on the user can be controlled.

The first side head belt151has a first gear rack portion151aextending into the bearing base120, and the second side head belt152has a second gear rack portion152aextending into the bearing base120. Specifically, the second gear rack portion152ais configured to stack on the first gear rack portion151a, and the first gear144is engaged with a first internal gear rack151bof the first gear rack portion151aand a second internal gear rack152bof the second gear rack portion152a. On the other hand, the auxiliary head belt153has an auxiliary gear rack portion153aextending into the bearing base120. Specifically, the auxiliary gear rack portion153ais configured to stack on the second gear rack portion152a, and the second gear145is engaged with an auxiliary internal gear rack153bof the auxiliary gear rack portion153a. Further, the second internal gear rack152bis located between the first gear rack portion151aand the auxiliary gear rack portion153a. The auxiliary gear rack portion153ais perpendicular to the first gear rack portion151aand the second gear rack portion152a, and the first gear rack portion151a, the second gear rack portion152a, and the auxiliary gear rack portion153acan move relatively to each other.

When the knob130is rotated clockwise with respect to the bearing base120, the guiding element140is driven by the knob130to rotate synchronously. Meanwhile, the first gear144and the second gear145are rotated synchronously as well. Specifically, the first gear144drives the first gear rack portion151aand the second gear rack portion152ato move along two opposite directions, respectively, and the second gear145drives the auxiliary gear rack portion153ato move in a direction perpendicular to the first gear rack portion151aand the second gear rack portion152a. In other words, with the integrated design of the knob130and the double gears (i.e., the first gear144and the second gear145), the user can drive the double gears (i.e., the first gear144and the second gear145) to rotate through rotating the knob130, and can drive the first side head belt151, the second side head belt152, and the auxiliary head belt153to move synchronously through the synchronously rotated double gears (i.e., the first gear144and the second gear145), so as to quickly adjust the degree of tightness of the head-mounted display100when put on the user.

For example, the gear ratio of the first gear144to the second gear145may be 7:4. With such a design, during the process of driving the first side head belt151, the second side head belt152, and the auxiliary head belt153to synchronously move through the synchronously rotated double gears (i.e., the first gear144and the second gear145), the moving amounts of the first side head belt151and the second side head belt152are larger than the moving amount of the auxiliary head belt153, so as to fit the contour differences between different regions of the head, such as the contour differences between the left and right sides of the head and the top of the head. In other embodiments, the gear ratio of the first gear to the second gear may be additionally adjusted according to the requirements of design.

In the present embodiment, the bearing base120includes a plurality of limiting portions123that are located around the first gear144and the second gear145and are used to define a first limiting channel124and a second limiting channel125perpendicular to each other. Further, the first gear rack portion151aand the second gear rack portion152aare slidably disposed inside the first limiting channel124, and the auxiliary gear rack portion153ais slidably disposed inside the second limiting channel125, so as to increase the stability of the first side head belt151, the second side head belt152, and the auxiliary head belt153when moving.

Based on the above, with the integrated design of the knob and the double gears in the disclosure, the user may drive the double gears to be rotated by rotating the knob, and the auxiliary head belt, the first side head belt and the second side head belt may be driven to move synchronously by the synchronously rotating double gears. As a result, the degree of tightness may be quickly adjusted when the user wears the head-mounted display. In other words, the head-mounted display of the disclosure is convenient to use.