Strap adjusting device and wearable device

Smart glasses, comprising:

• a host housing;
• a tightness adjusting mechanism, opposite to the host housing;
• a strap assembly, connected to the host housing and the tightness adjusting mechanism to obtain an annular frame, the strap assembly comprising:
• a first head strap, connected to an end of the host housing and an end of the tightness adjusting mechanism;
• and
• a second head strap, connected to an opposite end of the host housing and an opposite end of the tightness adjusting mechanism;
• a force-bearing component, comprising:
• a fixing plate, arranged on the annular frame;
• and
• a cushion, arranged on the fixing plate, and configured to contact with a back of a head of a user;
• and
• a first sensor, arranged on the force-bearing component, and configured to detect a deformation parameter value of the cushion;
• wherein the tightness adjusting mechanism is cooperatively connected to the first head strap and the second head strap and configured to adjust an overlapping length between the first head strap and the second head strap, in response to the deformation parameter value of the cushion;
• wherein the tightness adjusting mechanism is configured to stop adjusting the overlapping length between the first head strap and the second head strap, in response to the first sensor detecting the deformation parameter value of the cushion reaching a preset threshold;
• wherein a first end of the first head strap and a second end of the second head strap overlap with each other, a first length-adjusting hole is defined at the first end, a second length-adjusting hole is defined at the second end, a first sawtooth wave is arranged on a wall of the first length-adjusting hole, and a second sawtooth wave is arranged on a wall of the second length-adjusting hole;
• wherein the tightness adjusting mechanism comprises:
• a housing for the tightness adjusting mechanism, comprising a continuous channel, wherein the first end and the second end are received in the continuous channel;
• a ratchet-pawl mechanism, accommodated in the housing for the tightness adjusting mechanism;
• wherein the ratchet-pawl mechanism comprises:
• a ratchet;
• a pawl assembly, engaging with the ratchet, and comprising an engaging gear;
• wherein the engaging gear is arranged in both the first length-adjusting hole and the second length-adjusting hole, and is engaged with both the first sawtooth wave and the second sawtooth wave, the first sawtooth wave is located on one side of the engaging gear, and the second sawtooth wave is located on a side of the engaging gear opposite to the first sawtooth wave;
• a transmission gear, accommodated in the housing for the tightness adjusting mechanism, and engaged with the pawl assembly to drive the pawl assembly to rotate;
• and
• a driving assembly, accommodated in the housing for the tightness adjusting mechanism, and engaged with the transmission gear;
• wherein in response to the deformation parameter value of the cushion, the driving assembly is configured to drive the pawl assembly to rotate by driving the transmission gear to rotate, and the engaging gear is driven to rotate, such that the first head strap and the second head strap are driven to move relative to each other;
• wherein the pawl assembly further comprises:
• a mounting element, wherein the engaging gear is arranged on one side of the mounting element;
• a rotating plate, arranged on the other side of the mounting element, being rotatable, and cooperating with the transmission gear;
• and
• a pawl, pivotally connected to the mounting element, wherein one end of the pawl slidably abuts against a side surface of the rotating plate, and the other end of the pawl is engaged with the ratchet under an elastic force applied by an elastic member.

A strap adjusting device for adjusting a length of a strap of smart glasses, comprising:

• a housing, connected to the strap;
• a cushion, arranged on the housing, and configured to contact with a back of a head of a user;
• a first sensor, arranged on at least one of the housing or the cushion, and configured to detect a deformation parameter value of the cushion;
• and
• a tightness adjusting mechanism, cooperatively connected to the strap, and configured to adjust the length of the strap;
• and
• a processor, configured to control the tightness adjusting mechanism to adjust the length of the strap, in response to the deformation parameter value of the cushion detected by the first sensor;
• wherein a length-adjusting hole is defined at the strap, a sawtooth wave is arranged on a wall of the length-adjusting hole;
• wherein the tightness adjusting mechanism comprises:
• a ratchet;
• a pawl assembly, engaging with the ratchet, and comprising an engaging gear;
• wherein the engaging gear is arranged in the length-adjusting hole, and is engaged with the sawtooth wave;
• a transmission gear, engaged with the pawl assembly to drive the pawl assembly to rotate;
• and
• a driving assembly, engaged with the transmission gear;
• wherein in response to the deformation parameter value of the cushion, the driving assembly is configured to drive the pawl assembly to rotate by driving the transmission gear to rotate, and the engaging gear is driven to rotate, such that the strap is driven to move;
• wherein the pawl assembly further comprises:
• a mounting element, wherein the engaging gear is arranged on one side of the mounting element;
• a rotating plate, arranged on the other side of the mounting element, being rotatable, and cooperating with the transmission gear;
• and
• a pawl, pivotally connected to the mounting element, wherein one end of the pawl slidably abuts against a side surface of the rotating plate, and the other end of the pawl is engaged with the ratchet under an elastic force applied by an elastic member.