Back pad on elastic band structure development

realitydeslab / holokit-x-hardware

HoloKit X Hardware Development

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Back pad on elastic band structure development #31

Closed nicolehong0 closed 2 years ago

nicolehong0 commented 4 years ago

Based on EVT head band, to develop back pad structure.

[x] to create CAD for back pad, plastic shell + foam + PU structure, ETC: 4/2.
[x] Amber to review the design and confirm for proto.
[x] arrange proto, foam part proto ETC: 4/27.
[x] to arrange plastic part proto, ETC: 4/27.
[x] foam+plastic part stuck up proto trial by foam supplier.

nicolehong0 commented 4 years ago

created a back pad plastic shell+foam 3D as: CAD link: https://github.com/holokit/HoloKitX-Hardware/blob/master/HME/Engineering/3DCAD/Release/back_pad_elastic_band_20200331.STEP @botaohu pls check and feedback.

botaohu commented 4 years ago

@nicolehong0 Shape looks good to me. Go ahead and prototyping. Please contact the prototyping company to make sure this kind of structure is manufacturable.

botaohu commented 4 years ago

@nicolehong0 can you make a version with 4cm shorter to print out at the same time?

nicolehong0 commented 4 years ago

Add 040120 CAD design.

decrease the length (from 184.92 to 126.36mm) to match the front head pad.
remove the perforation on plastic shell.

CAD link: https://github.com/holokit/HoloKitX-Hardware/blob/master/HME/Engineering/3DCAD/Release/back_pad_elastic_band_040120.STEP

botaohu commented 4 years ago

@nicolehong0 looks good to me for 040120 CAD .

nicolehong0 commented 4 years ago

Foam samples are available, processed by foaming molding, three stiffness level: 20A, 25A, 30A. Foam (25A)+plastic shell stack up protoes (based on 040120 CAD) are available.

Nicole's review:

25A foam should be too stiff, lower stiffness foam would be better (maybe lower than 20A).
No significant comfort improvement observed. No obvious pressure concentration on elastic head band observed for the EVT version (w/o head back pad). The pressure is mainly loaded on the forehead and nose. For the elastic band, the pressure on the two side areas results in discomfort, but not obvious on the back area. After adding the back pad, the pressure on forehead, nose and two side areas of the elastic band are not reduced.

botaohu commented 2 years ago

No need any more. We use the old headband back pad.